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Boston College
1.
Walkup, Daniel.
Doping and strain effects in strongly spin-orbit coupled
systems.
Degree: PhD, Physics, 2016, Boston College
URL: http://dlib.bc.edu/islandora/object/bc-ir:106810
► We present Scanning Tunneling Microscopy (STM) studies on several systems in which spin-orbit coupling leads to new and interesting physics, and where tuning by doping…
(more)
▼ We present Scanning Tunneling Microscopy (STM) studies
on several systems in which
spin-
orbit coupling leads to new and
interesting physics, and where tuning by doping and/or strain can
significantly modify the electronic properties, either inducing a
phase transition or by sharply influencing the electronic structure
locally. In the perovskite Iridate insulator Sr3Ir2O7, we
investigate the parent compound, determining the band gap and its
evolution in response to point defects which we identify as apical
oxygen vacancies. We investigate the effects of doping the parent
compound with La (in place of Sr) and Ru (in place of Ir). In both
cases a metal-insulator transition (MIT) results: at x ~ 38% with
Ru, and x ~ 5% with La. In the La-doped samples we find nanoscale
phase separation at dopings just below the MIT, with metallic
spectra associated with clusters of La atoms. Further, we find
resonances near the Fermi energy associated with individual La
atoms, suggesting an uneven distribution of dopants among the
layers of the parent compound. Bi2Se3 is a topological insulator
which hosts linearly dispersing Dirac surface states. Doping with
In (in place of Bismuth) brings about topological phase transition,
achieving a trivial insulator at x ~ 4%. We use high-magnetic field
Landau level spectroscopy to study the surface state’s properties
approaching the phase transition and find, by a careful analysis of
the peak positions find behavior consistent with strong
surface-state Zeeman effects: g~50. This interpretation implies,
however, a relabeling of the Landau levels previously observed in
pristine Bi2Se3, which we justify through ab initio calculations.
The overall picture is of a g-factor which steadily decreases as In
is added up to the topological phase transition. Finally, we
examine the effects of strain on the surface states of (001) thin
films of the topological crystalline insulator SnTe. When these
films are grown on closely-related substrates—in this case
PbSe(001)—a rich pattern of surface strain emerges. We use
phase-sensitive analysis of atomic-resolution STM topographs to
measure the strain locally, and spatially-resolved quasiparticle
interference imaging to compare the Dirac point positions in
regions with different types of strain, quantifying for the first
time the effect of anisotropic strain on the surface states of a
topological crystalline insulator.
Advisors/Committee Members: Vidya Madhavan (Thesis advisor).
Subjects/Keywords: Spin-orbit coupling
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Chicago ·
MLA ·
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APA (6th Edition):
Walkup, D. (2016). Doping and strain effects in strongly spin-orbit coupled
systems. (Doctoral Dissertation). Boston College. Retrieved from http://dlib.bc.edu/islandora/object/bc-ir:106810
Chicago Manual of Style (16th Edition):
Walkup, Daniel. “Doping and strain effects in strongly spin-orbit coupled
systems.” 2016. Doctoral Dissertation, Boston College. Accessed January 23, 2021.
http://dlib.bc.edu/islandora/object/bc-ir:106810.
MLA Handbook (7th Edition):
Walkup, Daniel. “Doping and strain effects in strongly spin-orbit coupled
systems.” 2016. Web. 23 Jan 2021.
Vancouver:
Walkup D. Doping and strain effects in strongly spin-orbit coupled
systems. [Internet] [Doctoral dissertation]. Boston College; 2016. [cited 2021 Jan 23].
Available from: http://dlib.bc.edu/islandora/object/bc-ir:106810.
Council of Science Editors:
Walkup D. Doping and strain effects in strongly spin-orbit coupled
systems. [Doctoral Dissertation]. Boston College; 2016. Available from: http://dlib.bc.edu/islandora/object/bc-ir:106810

University of Texas – Austin
2.
-5176-5677.
Investigations into the biosynthesis of the nitrogenase cofactor, and the donor and magnetic properties of novel group 5 anions coordinated to a paramagnetic metal center.
Degree: PhD, Chemistry, 2020, University of Texas – Austin
URL: http://dx.doi.org/10.26153/tsw/9168
► The reduction of dinitrogen to ammonia is a critical transformation to modern society and is responsible for much of the agricultural advancement over the past…
(more)
▼ The reduction of dinitrogen to ammonia is a critical transformation to modern society and is responsible for much of the agricultural advancement over the past century. Industrially, this is accomplished by the Haber-Bosch process, where N₂ and H₂ are converted to NH₃ with the use of high temperatures and pressures; a process which consumes over 1% of the world’s energy annually. This is further exacerbated by the need to generate H₂ from natural gas leading to additional production of greenhouse gasses. The same reactivity is accomplished by nitrogenase at ambient temperatures and pressures, and further understanding of the enzyme could lend insight towards more efficient industrial processes. The cofactor of nitrogenase is highly unique, featuring a carbide (C⁴⁻) ligated to 6 Fe centers. To understand the biogenesis of the unique active site, a set of alkali supported, reduced FeS clusters were synthesized. A closed loop of cluster interconversions was documented, and it was demonstrated that Fe-coordinated PhS⁻ can be converted to S²⁻ under strongly reducing conditions. The all-inorganic FeS clusters further offered the unique opportunity to study radical hydrogen abstraction of a bound methyl thiolate; a process which seeks to model the S-adenosyl methionine mediated carbide formation of the nitrogenase cofactor in NifB. Separately, novel anionic ligands utilizing Sb and P chelated to a stabilizing biphenyl unit were synthesized and coordinated to a paramagnetic Co(I) metal center. The donor properties and extent of translation
spin orbit coupling of heavy atoms were investigated utilizing magnetization and near-IR absorption measurements. It was determined that the Sb analogue indeed showed a greater extent of axial zero field splitting (D), which is known to increase with increasing
spin orbit coupling. A tentative value for the
spin orbit coupling constant [lambda] was also found by utilizing values obtained for μ [subscript eff] and 10 dq.
Advisors/Committee Members: Rose, Michael J., Ph. D. (advisor), Que, Emily (committee member), Humphrey, Simon (committee member), Fast, Walter (committee member).
Subjects/Keywords: Nitrogenase; Spin orbit coupling
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
-5176-5677. (2020). Investigations into the biosynthesis of the nitrogenase cofactor, and the donor and magnetic properties of novel group 5 anions coordinated to a paramagnetic metal center. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://dx.doi.org/10.26153/tsw/9168
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
-5176-5677. “Investigations into the biosynthesis of the nitrogenase cofactor, and the donor and magnetic properties of novel group 5 anions coordinated to a paramagnetic metal center.” 2020. Doctoral Dissertation, University of Texas – Austin. Accessed January 23, 2021.
http://dx.doi.org/10.26153/tsw/9168.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
-5176-5677. “Investigations into the biosynthesis of the nitrogenase cofactor, and the donor and magnetic properties of novel group 5 anions coordinated to a paramagnetic metal center.” 2020. Web. 23 Jan 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
-5176-5677. Investigations into the biosynthesis of the nitrogenase cofactor, and the donor and magnetic properties of novel group 5 anions coordinated to a paramagnetic metal center. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2020. [cited 2021 Jan 23].
Available from: http://dx.doi.org/10.26153/tsw/9168.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
-5176-5677. Investigations into the biosynthesis of the nitrogenase cofactor, and the donor and magnetic properties of novel group 5 anions coordinated to a paramagnetic metal center. [Doctoral Dissertation]. University of Texas – Austin; 2020. Available from: http://dx.doi.org/10.26153/tsw/9168
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

University of Arizona
3.
Chen, Kai.
Spin Transport in Magnetic Nano-Structures
.
Degree: 2017, University of Arizona
URL: http://hdl.handle.net/10150/626524
► Since the discovery of giant magnetoresistance in 1980s, Spintronics became an exciting field which studies numerous phenomena including the spin transport in magnetic heterostructures, magnetization…
(more)
▼ Since the discovery of giant magnetoresistance in 1980s, Spintronics became an exciting field which studies numerous phenomena including the
spin transport in magnetic heterostructures, magnetization dynamics and the interplay between them. I have investigated different topics during my graduate research. In this dissertation, I summarize all my projects including
spin pumping,
spin convertance and
spin injection into ballistic medium. First, we develop a linear response formalism for
spin pumping effect.
Spin pumping refers that a precessing emits a
spin current into its adjacent nonmagnetic surroundings, which was originally proposed using scattering theory. The newly developed formalism is demonstrated to be identical the early theory in limiting case. While our formalism is convenient to include the effects of disorders and
spin-
orbit coupling which can resolve the quantitative controversies between early theory and experiments. Second, the
spin pumping experiments indicates a much smaller
spin Hall angle compared with the results obtained via the
spin transfer torque measurements. We found that such issues can be resolved when taking into consideration the effects of non-local conductivity. And we conclude neither of the two methods measures the real
spin Hall angle while the
spin pumping methods provides much accurate estimations. Third, we developed the
spin transport equations in weak scattering medium in the presence of
spin-
orbit coupling. Before this, all
spin dependent electron transport has been modeled by the conventional
spin diffusion equation. While recent
spin injection experiments have seen the failure of
spin diffusion equation. As the experimental fitting using
spin diffusion models led to unrealistic conclusions. At last, we study the
spin convertance in anti-ferromagnetic multilayers, where the
spin information can be mutually transferred between ferromagnetic/anti-ferromagnetic and conduction electrons. Our theory successfully explained the experiment results that the insertion of thin NiO film between YIG/Pt largely enhances the
spin Seebeck currents.
Advisors/Committee Members: Zhang, Shufeng (advisor), Wang, Weigang (committeemember), LeRoy, Brian (committeemember), Stafford, Charles (committeemember).
Subjects/Keywords: Magnons;
Spin-orbit Coupling;
Spin Pumping;
Spintronics
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Chen, K. (2017). Spin Transport in Magnetic Nano-Structures
. (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/626524
Chicago Manual of Style (16th Edition):
Chen, Kai. “Spin Transport in Magnetic Nano-Structures
.” 2017. Doctoral Dissertation, University of Arizona. Accessed January 23, 2021.
http://hdl.handle.net/10150/626524.
MLA Handbook (7th Edition):
Chen, Kai. “Spin Transport in Magnetic Nano-Structures
.” 2017. Web. 23 Jan 2021.
Vancouver:
Chen K. Spin Transport in Magnetic Nano-Structures
. [Internet] [Doctoral dissertation]. University of Arizona; 2017. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/10150/626524.
Council of Science Editors:
Chen K. Spin Transport in Magnetic Nano-Structures
. [Doctoral Dissertation]. University of Arizona; 2017. Available from: http://hdl.handle.net/10150/626524
4.
Calsaverini, Rafael Sola de Paula de Angelo.
Acoplamento spin-órbita inter-subbanda em heteroestruturas semicondutoras.
Degree: Mestrado, Física Básica, 2007, University of São Paulo
URL: http://www.teses.usp.br/teses/disponiveis/76/76131/tde-05122007-160519/
;
► Neste trabalho apresentamos a determinação autoconsistente da constante de interação spin-órbita em heteroestruturas com duas sub-bandas. Como recentemente proposto, ao obter o hamiltoneano de um…
(more)
▼ Neste trabalho apresentamos a determinação autoconsistente da constante de interação spin-órbita em heteroestruturas com duas sub-bandas. Como recentemente proposto, ao obter o hamiltoneano de um sistema com duas sub-bandas na aproximação de massa efetiva, constata-se a presença de um acoplamento inter-subbanda que não se anula mesmo em heteroestruturas simétricas. Apresentamos aqui as deduções teóricas que levaram à proposição desse novo acoplamento e mostramos o cálculo autoconsistente da intensidade do acoplamento e a comparamos com a intensidade do acoplamento Rashba, já amplamente estudado. Discutimos o método k.p e a Aproximação da Função Envelope e mostramos a obtenção do modelo de Kane 8x8 para semicondutores com estrutura zincblende. Aplicamos o método do \"folding down\'áo hamiltoneano de Kane isolando o setor correspondente à banda de condução. Escrevemos dessa forma um hamiltoneano efetivo para a banda de condução no contexto de um poço quântico com uma barreira. Através da projeção desse hamiltoneano nos dois primeiros estados da parte orbital verifica-se o surgimento de um acoplamento inter-subbanda. Finalmente escrevemos o hamiltoneano efetivo 4x4 que descreve as duas primeiras subbandas de um poço quântico e obtivemos seus autoestados e autoenergias. Finalmente fizemos o cálculo autoconsistente das funções de onda e energias de um gás de elétrons em poços quânticos simples e duplos através da aproximação de Hartree e a partir desses resultados determinamos o valor da constante de acoplamento Rashba e da nova constante inter-subbanda. Entre os resultados obtidos destacam-se o controle elétrico da constante de acoplamento inter-subbanda através de um eletrodo externo e um efeito de renormalização da massa efetiva que pode chegar até 5% em algumas estruturas.
In this work we present the self-consistent determination of the spin-orbit coupling constant in heterostructure with two subbands.As recently proposed, the effective hamiltonian for the conduction band in the effective mass approximation contains an inter-subband spin-orbit coupling which is non-zero even for symmetric heterostructures. We present the theoretical derivation which leads to this proposal and show a selfconsistent determination of the coupling constant. We also compare the magnitude of the new coupling constant with the usual Rashba coupling. Starting with a discussion of the k.p method and the Envelope Function Approximation (EFA) we show the derivation of the 8x8 Kane model for semiconductors with zincblende structure. We then apply the \"folding down\'ḿethod, isolating the conduction band sector of the EFA hamiltonian. By projecting this hamiltonian in the first two states of the orbital part, we find an effective 4x4 hamiltonian that contains an inter-subband spin orbit coupling. The eingenvalues and eigenvectors of this hamiltonian are shown and, specializing the model for single and double quantum wells, we self-consistently determine the inter-subband and Rashba coupling constants in the Hartree approximation. The…
Advisors/Committee Members: Menezes, José Carlos Egues de.
Subjects/Keywords: Acoplamento inter-subbanda; Acoplamento spin-órbita; Inter-subband coupling; Inter-subband coupling; Spin-orbit coupling; Spin-orbit coupling; Spintrônica; Spintronics; Spintronics
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Calsaverini, R. S. d. P. d. A. (2007). Acoplamento spin-órbita inter-subbanda em heteroestruturas semicondutoras. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/76/76131/tde-05122007-160519/ ;
Chicago Manual of Style (16th Edition):
Calsaverini, Rafael Sola de Paula de Angelo. “Acoplamento spin-órbita inter-subbanda em heteroestruturas semicondutoras.” 2007. Masters Thesis, University of São Paulo. Accessed January 23, 2021.
http://www.teses.usp.br/teses/disponiveis/76/76131/tde-05122007-160519/ ;.
MLA Handbook (7th Edition):
Calsaverini, Rafael Sola de Paula de Angelo. “Acoplamento spin-órbita inter-subbanda em heteroestruturas semicondutoras.” 2007. Web. 23 Jan 2021.
Vancouver:
Calsaverini RSdPdA. Acoplamento spin-órbita inter-subbanda em heteroestruturas semicondutoras. [Internet] [Masters thesis]. University of São Paulo; 2007. [cited 2021 Jan 23].
Available from: http://www.teses.usp.br/teses/disponiveis/76/76131/tde-05122007-160519/ ;.
Council of Science Editors:
Calsaverini RSdPdA. Acoplamento spin-órbita inter-subbanda em heteroestruturas semicondutoras. [Masters Thesis]. University of São Paulo; 2007. Available from: http://www.teses.usp.br/teses/disponiveis/76/76131/tde-05122007-160519/ ;

University of Delaware
5.
Wang, Tao.
Spin orbit coupling induced phenomena in spintronic devices.
Degree: PhD, University of Delaware, Department of Physics and Astronomy, 2017, University of Delaware
URL: http://udspace.udel.edu/handle/19716/23538
► Spin-orbit coupling (SOC) is a relativistic interaction between spin and orbital momentum that induces a plenty of novel phenomena including spin Hall effect (SHE), Rashba-Edelstein…
(more)
▼ Spin-
orbit coupling (SOC) is a relativistic interaction between
spin and orbital momentum that induces a plenty of novel phenomena including
spin Hall effect (SHE), Rashba-Edelstein effect (REE), topological surface states (TSS),
spin orbit toques (SOTs), etc. In this thesis work, we have conducted relevant researches in order to develop materials and heterostructures, as well as new phenomena that can lead to high efficiency in generating SOTs or switching the magnetization. We have also investigated fabrication technique that speeds up the fabrication of nanoscale devices. ☐ A nanofabrication procedure has been developed based on shadow mask and angle deposition techniques. It is an efficient bottom-up, as oppose to top-down lithography technique, to fabricate rather complicate devices. A comprehensive study of shadow mask technique has been accomplished to fabricate magnetoelectric (ME) device based on voltage controlled boundary magnetism of antiferromagnet Cr2O3 and magnetic tunnel junctions. ☐ The researches on SOTs focus on SHE, REE and TSS in which a charge current is converted into
spin current that exerts the SOTs on the magnetization of neighboring ferromagnetic layer. First, we have studied the charge to
spin conversion efficiency in 3d light transition metal vanadium in V/CoFeB bilayer, which shows a surprisingly large
spin Hall angle that is comparable to that of Pt. Second, we have investigated the temperature dependent SOTs in Bi2Se3/Co and Bi2Se3/Ni80Fe20 bilayers, and confirmed the existence of TSS in Bi2Se3/Co systems. Finally, we have discovered a novel
spin rotation behaviors in a ferromagnetic metal, where the
spin polarization is rotated around the magnetization. It implies that a perpendicularly polarized
spin current can be generated by an in-plane charge current through a ferromagnetic metal, which can be applied to realize the anti-damping switching process in magnetic heterostructures.
Advisors/Committee Members: Xiao, John Q..
Subjects/Keywords: Pure sciences; Coupling; Orbit; Spin; Spintronic
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APA ·
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CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Wang, T. (2017). Spin orbit coupling induced phenomena in spintronic devices. (Doctoral Dissertation). University of Delaware. Retrieved from http://udspace.udel.edu/handle/19716/23538
Chicago Manual of Style (16th Edition):
Wang, Tao. “Spin orbit coupling induced phenomena in spintronic devices.” 2017. Doctoral Dissertation, University of Delaware. Accessed January 23, 2021.
http://udspace.udel.edu/handle/19716/23538.
MLA Handbook (7th Edition):
Wang, Tao. “Spin orbit coupling induced phenomena in spintronic devices.” 2017. Web. 23 Jan 2021.
Vancouver:
Wang T. Spin orbit coupling induced phenomena in spintronic devices. [Internet] [Doctoral dissertation]. University of Delaware; 2017. [cited 2021 Jan 23].
Available from: http://udspace.udel.edu/handle/19716/23538.
Council of Science Editors:
Wang T. Spin orbit coupling induced phenomena in spintronic devices. [Doctoral Dissertation]. University of Delaware; 2017. Available from: http://udspace.udel.edu/handle/19716/23538

University of Toronto
6.
Cook, Ashley Megan.
Double Perovskites with Strong Spin-orbit Coupling.
Degree: PhD, 2016, University of Toronto
URL: http://hdl.handle.net/1807/76358
► We first present theoretical analysis of powder inelastic neutron scattering experiments in Ba2FeReO6 performed by our experimental collaborators. Ba2FeReO6, a member of the double perovskite…
(more)
▼ We first present theoretical analysis of powder inelastic neutron scattering experiments in Ba2FeReO6 performed by our experimental collaborators. Ba2FeReO6, a member of the double perovskite family of materials, exhibits half-metallic behavior and high Curie temperatures Tc, making it of interest for spintronics applications. To interpret the experimental data, we develop a local moment model, which incorporates the interaction of Fe spins with
spin-orbital locked magnetic moments on Re, and show that it captures the experimental observations. We then develop a tight-binding model of the double perovskite Ba2FeReO6, a room temperature ferrimagnet with correlated and
spin-
orbit coupled Re t2g electrons moving in the background of Fe moments stabilized by
Hundâ s
coupling. We show that for such 3d/5d double perovskites, strong correlations on the 5d-element (Re) are essential in driving a half-metallic ground state. Incorporating both strong
spin-
orbit coupling and the Hubbard repulsion on Re leads to a band structure consistent with ab initio calculations. The uncovered interplay of strong correlations and
spin-
orbit coupling lends partial support to our previous work, which used a local moment
description to capture the
spin wave dispersion found in neutron scattering measurements. We then adapt this tight-binding model to study {111}-grown bilayers of half-metallic double perovskites such as Sr2FeMoO6. The combination of
spin-
orbit coupling, inter-orbital hybridization and symmetry-allowed trigonal distortion leads to a rich phase diagram with tunable ferromagnetic order, topological C=1 and 2 Chern
bands, and a C = 2 quantum anomalous Hall insulator regime. We have also performed theoretical analysis of inelastic neutron scattering (INS) experiments to investigate
the magnetic excitations in the weakly distorted face-centered-cubic (fcc) iridate double perovskites La2ZnIrO6 and La2MgIrO6. Models with dominant Kitaev exchange seem to most naturally account for the neutron data as well as the measured frustration parameters of these materials, while the uniaxial Ising anisotropy does not. Our
findings highlight how even seemingly conventional magnetic orders in oxide materials containing heavy transition metal ions may be driven by highly-directional exchange interactions rooted in strong
spin-
orbit coupling. Motivated by experiments on the double perovskites La2ZnIrO6 and La2MgIrO6, we lastly study the magnetism
of
spin-
orbit coupled j
eff =1/2 iridium moments on the three-dimensional, geometrically frustrated, facecentered cubic lattice. The symmetry-allowed nearest-neighbor interaction includes Heisenberg, Kitaev, and symmetric off-diagonal exchange. A Luttinger-Tisza analysis shows a rich variety of orders, including collinear AII type antiferromagnetism, stripe order with moments along the {111}-direction, and incommensurate non-coplanar
spirals, and we use Monte Carlo simulations to determine their magnetic ordering temperatures.
Advisors/Committee Members: Paramekanti, Arun, Physics.
Subjects/Keywords: double perovskites; spin-orbit coupling; 0611
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Cook, A. M. (2016). Double Perovskites with Strong Spin-orbit Coupling. (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/76358
Chicago Manual of Style (16th Edition):
Cook, Ashley Megan. “Double Perovskites with Strong Spin-orbit Coupling.” 2016. Doctoral Dissertation, University of Toronto. Accessed January 23, 2021.
http://hdl.handle.net/1807/76358.
MLA Handbook (7th Edition):
Cook, Ashley Megan. “Double Perovskites with Strong Spin-orbit Coupling.” 2016. Web. 23 Jan 2021.
Vancouver:
Cook AM. Double Perovskites with Strong Spin-orbit Coupling. [Internet] [Doctoral dissertation]. University of Toronto; 2016. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/1807/76358.
Council of Science Editors:
Cook AM. Double Perovskites with Strong Spin-orbit Coupling. [Doctoral Dissertation]. University of Toronto; 2016. Available from: http://hdl.handle.net/1807/76358

Princeton University
7.
Phelan, Brendan Francis.
A MAGNETISM-BASED APPROACH TO EXAMINING SPIN-ORBIT COUPLING EFFECTS IN SOLID SYSTEMS OF ISOLATED IRIDIUM OCTAHEDRA
.
Degree: PhD, 2016, Princeton University
URL: http://arks.princeton.edu/ark:/88435/dsp01p5547t79h
► This thesis explores the relative strengths of Spin-Orbit Coupling (SOC) in several perovskite-like systems that feature uninterrupted arrays of isolated IrO6 octahedra. Iridate compounds are…
(more)
▼ This thesis explores the relative strengths of
Spin-
Orbit Coupling (SOC) in several perovskite-like systems that feature uninterrupted arrays of isolated IrO6 octahedra. Iridate compounds are particularly interesting to the community due to their relevance to emergent material properties such as insulating antiferromagnets, superconductors, and topological insulators. Recently literature has pointed to a complex interaction between SOC and crystal field splitting (CFS) in d5 metals. I utilize a straightforward, magnetic approach to determine the relative strengths of SOC vs CFS by chemically modifying structure and oxidation state. This contrasts with other work where advanced spectroscopic measurements are utilized to probe energy levels within a single compound. The focus of this study lies in two main methodologies: 1) Tracking the evolution of the Ir magnetic moment on progressing from 5d5 Ir4+ to 5d4 Ir5+ oxidation states that are clearly best described by a transition from a J=1/2 to a J=0 Ir magnetic state. In these cases, the evolution of the magnetic susceptibility shows the dominance of
spin-
orbit coupling in determining the magnetic properties of a material with highly isolated IrO6 octahedra. 2) Distorting J=0 Ir5+ systems where there is no emergence of an enhanced magnetic moment in the series on increasing the structural distortions, as would have been the case for significant crystal field splitting that reinforces the notion that
spin-
orbit coupling is the dominant force in determining the magnetism of iridium-oxygen octahedra in perovskite-like structures. The organization of this thesis is as follows: Chapter 1 presents a brief introduction to solid-state chemistry, iridates, and magnetism. Chapter 2 is an overview of experimental methodology and instrumentation. Chapter 3, presents a study of tuning the oxidation state of a new structure type: SrxLa11-xIr4O24. Chapter 4 presents a structural tuning of the Ir5+ system: Ba2-xSrxYIrO6. Finally, Chapter 5 provides a brief glimpse of the future of this new approach to studying this type of iridium-oxygen compounds.
Advisors/Committee Members: Cava, Robert J (advisor).
Subjects/Keywords: Iridates;
Iridium;
Magnetism;
Spin-Orbit Coupling
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Phelan, B. F. (2016). A MAGNETISM-BASED APPROACH TO EXAMINING SPIN-ORBIT COUPLING EFFECTS IN SOLID SYSTEMS OF ISOLATED IRIDIUM OCTAHEDRA
. (Doctoral Dissertation). Princeton University. Retrieved from http://arks.princeton.edu/ark:/88435/dsp01p5547t79h
Chicago Manual of Style (16th Edition):
Phelan, Brendan Francis. “A MAGNETISM-BASED APPROACH TO EXAMINING SPIN-ORBIT COUPLING EFFECTS IN SOLID SYSTEMS OF ISOLATED IRIDIUM OCTAHEDRA
.” 2016. Doctoral Dissertation, Princeton University. Accessed January 23, 2021.
http://arks.princeton.edu/ark:/88435/dsp01p5547t79h.
MLA Handbook (7th Edition):
Phelan, Brendan Francis. “A MAGNETISM-BASED APPROACH TO EXAMINING SPIN-ORBIT COUPLING EFFECTS IN SOLID SYSTEMS OF ISOLATED IRIDIUM OCTAHEDRA
.” 2016. Web. 23 Jan 2021.
Vancouver:
Phelan BF. A MAGNETISM-BASED APPROACH TO EXAMINING SPIN-ORBIT COUPLING EFFECTS IN SOLID SYSTEMS OF ISOLATED IRIDIUM OCTAHEDRA
. [Internet] [Doctoral dissertation]. Princeton University; 2016. [cited 2021 Jan 23].
Available from: http://arks.princeton.edu/ark:/88435/dsp01p5547t79h.
Council of Science Editors:
Phelan BF. A MAGNETISM-BASED APPROACH TO EXAMINING SPIN-ORBIT COUPLING EFFECTS IN SOLID SYSTEMS OF ISOLATED IRIDIUM OCTAHEDRA
. [Doctoral Dissertation]. Princeton University; 2016. Available from: http://arks.princeton.edu/ark:/88435/dsp01p5547t79h

University of Delaware
8.
Kandaz, Fatih.
Anisotropic spin relaxation in mesoscopic nonmagnetic channels.
Degree: PhD, University of Delaware, Department of Physics and Astronomy, 2018, University of Delaware
URL: http://udspace.udel.edu/handle/19716/23597
► Spin–orbit (SO) effects, which are essential for spintronics, not only generate spin currents and spin torques but also provide ways to modulate spin currents. However,…
(more)
▼ Spin–
orbit (SO) effects, which are essential for spintronics, not only generate
spin currents and
spin torques but also provide ways to modulate
spin currents. However, SO effects induce higher rates of
spin relaxation and therefore lead to shorter
spin-relaxation lengths in materials. This contradicts the general desire for a longer
spin-relaxation length to transport a
spin current over distance. In this work, we demonstrate that substantial surface
spin-
orbit effects and a long
spin-relaxation length can coexist in mesoscopic Cu channels. ☐ It is a common perception that the transport of a
spin current in polycrystalline metal is isotropic and independent of the polarization direction, even though
spin current is a tensorlike quantity and its polarization direction is a key variable. We demonstrate surprising anisotropic
spin relaxation in mesoscopic polycrystalline Cu channels in nonlocal
spin valves. For directions in the substrate plane, the
spin-relaxation length is longer for spins parallel to the Cu channel than for spins perpendicular to it, by as much as 9% at 10 K.
Spin-
orbit effects on the surfaces of Cu channels can account for this anisotropic
spin-relaxation. The finding suggests novel tunability of
spin current, not only by its polarization direction but also by electrostatic gating.
Advisors/Committee Members: Ji, Yi.
Subjects/Keywords: Pure sciences; Applied sciences; Magnetism; Spin current; Spin polarization; Spin relaxation; Spin-orbit coupling; Spintronics
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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APA (6th Edition):
Kandaz, F. (2018). Anisotropic spin relaxation in mesoscopic nonmagnetic channels. (Doctoral Dissertation). University of Delaware. Retrieved from http://udspace.udel.edu/handle/19716/23597
Chicago Manual of Style (16th Edition):
Kandaz, Fatih. “Anisotropic spin relaxation in mesoscopic nonmagnetic channels.” 2018. Doctoral Dissertation, University of Delaware. Accessed January 23, 2021.
http://udspace.udel.edu/handle/19716/23597.
MLA Handbook (7th Edition):
Kandaz, Fatih. “Anisotropic spin relaxation in mesoscopic nonmagnetic channels.” 2018. Web. 23 Jan 2021.
Vancouver:
Kandaz F. Anisotropic spin relaxation in mesoscopic nonmagnetic channels. [Internet] [Doctoral dissertation]. University of Delaware; 2018. [cited 2021 Jan 23].
Available from: http://udspace.udel.edu/handle/19716/23597.
Council of Science Editors:
Kandaz F. Anisotropic spin relaxation in mesoscopic nonmagnetic channels. [Doctoral Dissertation]. University of Delaware; 2018. Available from: http://udspace.udel.edu/handle/19716/23597
9.
Ilic, Stefan.
Quantum coherent phenomena in disordered transition metal dichalcogenide monolayers : Phénomènes quantiques cohérents dans les monocouches désordonnées de dichalcogénures de métaux de transition.
Degree: Docteur es, Physique théorique, 2019, Université Grenoble Alpes (ComUE)
URL: http://www.theses.fr/2019GREAY038
► Les monocouches de dichalcogénures de métaux de transition (TMDC) sont des matériaux bidimensionnels découverts récemment. Ils possèdent un fort couplage spin-orbite (SOC) intrinsèque qui agit…
(more)
▼ Les monocouches de dichalcogénures de métaux de transition (TMDC) sont des matériaux bidimensionnels découverts récemment. Ils possèdent un fort couplage
spin-orbite (SOC) intrinsèque qui agit comme un champ Zeeman effectif perpendiculaire, mais avec des orientations opposées dans chaque vallée située autour des points +K et -K de la zone Brillouin. En présence de désordre, ce SOC influence fortement les phénomènes quantiques cohérents dans les TMDC. Dans cette thèse, nous étudions deux de ces phénomènes : la supraconductivité et les corrections à la conductance dues aux interférences quantiques, telles que la localisation ou l’anti-localisation faible, ainsi que les fluctuations universelles de la conductance.Une supraconductivité a été identifiée expérimentalement dans plusieurs TMDC, aussi bien dans les régimes dopés n (MoS2, WS2) que p (NbSe2, TaS2). Dans ces matériaux, le SOC intrinsèque provoque un "appariement d'Ising" inhabituel des paires de Cooper. En effet, celles-ci sont formées avec des électrons provenant de vallées opposées, donc leurs spins sont figés perpendiculairement à la couche. Un champ magnétique appliqué parallèlement à la couche n’est donc pas efficace pour briser les paires de Cooper par l'effet paramagnétique, ce qui entraîne une augmentation considérable du champ critique dans le plan. C’est la signature principale de la supraconductivité d'Ising. Dans la première partie de ce travail, nous calculons le champ critique et la densité des états dans les TMDC supraconducteurs désordonnés. Nous montrons que la diffusion intra-vallée n'affecte pas ces propriétés. En revanche, elles dépendent fortement de la diffusion inter-vallée qui produit un mécanisme de brisure des paires de Cooper. Dans les supraconducteurs Ising dopés p, dans lesquels plusieurs bandes croisent le niveau de Fermi, nous identifions la diffusion inter-bande comme un autre mécanisme important de brisure des paires. Nous montrons qu'une faible diffusion inter-vallée ou inter-bande peut expliquer les observations expérimentales dans les supraconducteurs TMDC dopés n ou p, respectivement.Dans la deuxième partie de ce travail, nous calculons les corrections à la conductance dues aux interférences quantiques dans les TMDC métalliques. Leur mesure peut servir de sonde indépendante pour identifier la nature du SOC et du désordre. En raison de l'interaction entre la structure de la vallée et le SOC, ces matériaux présentent un riche comportement de localisation (ou anti-localisation) faible et des fluctuations universelles de la conductance, qui sont qualitativement différents des autres systèmes bidimensionnels, comme les métaux conventionnels ou le graphène. Nos résultats peuvent également être utilisés pour décrire les hétéro-structures graphène/TMDC, dans lesquelles le SOC est induit dans la couche de graphène. Nous discutons différents régimes de paramètres qui permettent d’interpréter des expériences récentes et d’évaluer l’intensité du SOC et du désordre. En outre, nous montrons qu'un champ Zeeman dans le plan peut être utilisé…
Advisors/Committee Members: Meyer, Julia (thesis director), Houzet, Manuel (thesis director).
Subjects/Keywords: Supraconductivité; Désordre; Couplage spin-Orbite; Superconductivity; Disorder; Spin-Orbit coupling; 530
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ilic, S. (2019). Quantum coherent phenomena in disordered transition metal dichalcogenide monolayers : Phénomènes quantiques cohérents dans les monocouches désordonnées de dichalcogénures de métaux de transition. (Doctoral Dissertation). Université Grenoble Alpes (ComUE). Retrieved from http://www.theses.fr/2019GREAY038
Chicago Manual of Style (16th Edition):
Ilic, Stefan. “Quantum coherent phenomena in disordered transition metal dichalcogenide monolayers : Phénomènes quantiques cohérents dans les monocouches désordonnées de dichalcogénures de métaux de transition.” 2019. Doctoral Dissertation, Université Grenoble Alpes (ComUE). Accessed January 23, 2021.
http://www.theses.fr/2019GREAY038.
MLA Handbook (7th Edition):
Ilic, Stefan. “Quantum coherent phenomena in disordered transition metal dichalcogenide monolayers : Phénomènes quantiques cohérents dans les monocouches désordonnées de dichalcogénures de métaux de transition.” 2019. Web. 23 Jan 2021.
Vancouver:
Ilic S. Quantum coherent phenomena in disordered transition metal dichalcogenide monolayers : Phénomènes quantiques cohérents dans les monocouches désordonnées de dichalcogénures de métaux de transition. [Internet] [Doctoral dissertation]. Université Grenoble Alpes (ComUE); 2019. [cited 2021 Jan 23].
Available from: http://www.theses.fr/2019GREAY038.
Council of Science Editors:
Ilic S. Quantum coherent phenomena in disordered transition metal dichalcogenide monolayers : Phénomènes quantiques cohérents dans les monocouches désordonnées de dichalcogénures de métaux de transition. [Doctoral Dissertation]. Université Grenoble Alpes (ComUE); 2019. Available from: http://www.theses.fr/2019GREAY038
10.
PRAVEEN DEORANI.
TANTALUM AND BISMUTH SELENIDE BASED SPIN PUMPING DEVICES.
Degree: 2015, National University of Singapore
URL: http://scholarbank.nus.edu.sg/handle/10635/121000
Subjects/Keywords: Spin pumping spin orbit coupling
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
DEORANI, P. (2015). TANTALUM AND BISMUTH SELENIDE BASED SPIN PUMPING DEVICES. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/121000
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
DEORANI, PRAVEEN. “TANTALUM AND BISMUTH SELENIDE BASED SPIN PUMPING DEVICES.” 2015. Thesis, National University of Singapore. Accessed January 23, 2021.
http://scholarbank.nus.edu.sg/handle/10635/121000.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
DEORANI, PRAVEEN. “TANTALUM AND BISMUTH SELENIDE BASED SPIN PUMPING DEVICES.” 2015. Web. 23 Jan 2021.
Vancouver:
DEORANI P. TANTALUM AND BISMUTH SELENIDE BASED SPIN PUMPING DEVICES. [Internet] [Thesis]. National University of Singapore; 2015. [cited 2021 Jan 23].
Available from: http://scholarbank.nus.edu.sg/handle/10635/121000.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
DEORANI P. TANTALUM AND BISMUTH SELENIDE BASED SPIN PUMPING DEVICES. [Thesis]. National University of Singapore; 2015. Available from: http://scholarbank.nus.edu.sg/handle/10635/121000
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Toronto
11.
Lee, Kin Ho.
Theoretical Progress in Hyperhoneycomb Iridate β-Li2IrO3.
Degree: PhD, 2015, University of Toronto
URL: http://hdl.handle.net/1807/71049
► Iridium-based compounds display a rich variety of physical behaviours that stems from the intricate interplay of many energy scales. In this thesis, we explore the…
(more)
▼ Iridium-based compounds display a rich variety of physical behaviours that stems from the intricate interplay of many energy scales. In this thesis, we explore the consequences of this in some of the recent theoretical progress on the hyperhoneycomb iridate β-Li2IrO3. Beginning with first principle calculations, we gain an understanding of the role of distortions,
spin-
orbit coupling, and the validity of the j_eff = 1/2 description. After studying some basic properties of the weakly interacting band structure, we proceed to the strong correlation limit by deriving an effective pseudospin model that highlights the importance of multi-orbital interactions in iridium-based compounds. We investigate in detail the various magnetic ground states of this model. Using the results obtained in the first principle calculation, we find that the model is able to reproduce the complex and unconventional incommensurate magnetic order found experimentally. Furthermore, we find that β-Li2IrO3 is likely dominated by a ferromagnetic Kitaev exchange interaction, placing it near the exactly solvable
spin liquid of the Kitaev limit. We explore one aspect of this three-dimensional
spin liquid: that of its one-dimensional spinon Fermi surface. We find that this Fermi surface is topologically stable and ensures the existence of gapless and dispersionless boundary states. We show that the Kitaev
spin liquid is a rare example of a three-dimensional, strongly correlated phase with bulk excitations and protected gapless boundary excitations. In conclusion, we discuss some future directions in the study of β-Li2IrO3 and iridate systems in general.
Advisors/Committee Members: Kim, Yong Baek, Physics.
Subjects/Keywords: hyperhoneycomb; iridate; Kitaev; magnetism; spin liquid; spin-orbit coupling; 0611
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lee, K. H. (2015). Theoretical Progress in Hyperhoneycomb Iridate β-Li2IrO3. (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/71049
Chicago Manual of Style (16th Edition):
Lee, Kin Ho. “Theoretical Progress in Hyperhoneycomb Iridate β-Li2IrO3.” 2015. Doctoral Dissertation, University of Toronto. Accessed January 23, 2021.
http://hdl.handle.net/1807/71049.
MLA Handbook (7th Edition):
Lee, Kin Ho. “Theoretical Progress in Hyperhoneycomb Iridate β-Li2IrO3.” 2015. Web. 23 Jan 2021.
Vancouver:
Lee KH. Theoretical Progress in Hyperhoneycomb Iridate β-Li2IrO3. [Internet] [Doctoral dissertation]. University of Toronto; 2015. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/1807/71049.
Council of Science Editors:
Lee KH. Theoretical Progress in Hyperhoneycomb Iridate β-Li2IrO3. [Doctoral Dissertation]. University of Toronto; 2015. Available from: http://hdl.handle.net/1807/71049

Purdue University
12.
Hong, Seokmin.
SPIN CIRCUIT REPRESENTATION OF ELECTRONIC TRANSPORT IN MATERIALS WITH SPIN ORBIT COUPLING.
Degree: PhD, Electrical and Computer Engineering, 2014, Purdue University
URL: https://docs.lib.purdue.edu/open_access_dissertations/1075
► Modern nanomagnetic devices involve materials and phenomena featuring both spin and charge transport. SPICE compatible spin circuits with 4-component voltage and current (1 for charge…
(more)
▼ Modern nanomagnetic devices involve materials and phenomena featuring both
spin and charge transport. SPICE compatible
spin circuits with 4-component voltage and current (1 for charge and 3 for
spin) have been developed to represent this emerging class of devices. However there has not been much work on circuit representation for materials with high
spin-
orbit coupling (SOC) which are becoming increasingly important with the discovery of giant
spin Hall effect (GSHE) and topological insulators.
Advisors/Committee Members: Supriyo Datta, Mark S. Lundstrom, Muhammad A. Alam, Yong P. Chen.
Subjects/Keywords: quantum transport; Spin circuit; spin Hall effect; spin orbit coupling; topological insulators
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Hong, S. (2014). SPIN CIRCUIT REPRESENTATION OF ELECTRONIC TRANSPORT IN MATERIALS WITH SPIN ORBIT COUPLING. (Doctoral Dissertation). Purdue University. Retrieved from https://docs.lib.purdue.edu/open_access_dissertations/1075
Chicago Manual of Style (16th Edition):
Hong, Seokmin. “SPIN CIRCUIT REPRESENTATION OF ELECTRONIC TRANSPORT IN MATERIALS WITH SPIN ORBIT COUPLING.” 2014. Doctoral Dissertation, Purdue University. Accessed January 23, 2021.
https://docs.lib.purdue.edu/open_access_dissertations/1075.
MLA Handbook (7th Edition):
Hong, Seokmin. “SPIN CIRCUIT REPRESENTATION OF ELECTRONIC TRANSPORT IN MATERIALS WITH SPIN ORBIT COUPLING.” 2014. Web. 23 Jan 2021.
Vancouver:
Hong S. SPIN CIRCUIT REPRESENTATION OF ELECTRONIC TRANSPORT IN MATERIALS WITH SPIN ORBIT COUPLING. [Internet] [Doctoral dissertation]. Purdue University; 2014. [cited 2021 Jan 23].
Available from: https://docs.lib.purdue.edu/open_access_dissertations/1075.
Council of Science Editors:
Hong S. SPIN CIRCUIT REPRESENTATION OF ELECTRONIC TRANSPORT IN MATERIALS WITH SPIN ORBIT COUPLING. [Doctoral Dissertation]. Purdue University; 2014. Available from: https://docs.lib.purdue.edu/open_access_dissertations/1075

Rice University
13.
Balasubramanian, Ramachandhran.
Rashba Spin-Orbit Coupled Quantum Gases.
Degree: PhD, Natural Sciences, 2014, Rice University
URL: http://hdl.handle.net/1911/76345
► Spin-orbit (SO) coupling leads to many fundamental phenomena in a wide range of quantum systems from nuclear physics, condensed matter physics to atomic physics. For…
(more)
▼ Spin-
orbit (SO)
coupling leads to many fundamental phenomena in a wide range of quantum systems from nuclear physics, condensed matter physics to atomic physics. For instance, in electronic condensed matter systems, SO
coupling can lead to quantum
spin Hall states or topological insulators, which have potential applications in quantum devices. Recently, SO
coupling has been artificially induced in quantum liquids - ultracold dilute atomic Bose and Fermi gases - by the so-called synthetic gauge fields. Combined with unprecedented controllability of interactions and geometry in ultracold atoms, this manipulation of SO
coupling opens an entirely new paradigm for studying strong correlations of quantum many-body systems under Abelian and non-Abelian gauge fields. In the major portion of this thesis, we theoretically investigate the ground state and collective excitations of a two-component Bose gas in a two-dimensional harmonic trap,
subject to Rashba SO
coupling. Our work represents an important extension into the regime of non-Abelian gauge field in which the
spin degrees of freedom play an essential role. – Abstract and Thesis are based on our publications in:
(1) 10.1103/PhysRevLett.108.010402
(2) 10.1103/PhysRevA.85.023606
(3) 10.1103/PhysRevA.87.033627
(4) 10.1103/PhysRevA.83.033607
(5) 10.1103/PhysRevLett.110.123201
Advisors/Committee Members: Pu, Han (advisor), Hulet, Randall G. (committee member), Kono, Junichiro (committee member).
Subjects/Keywords: Spin-orbit coupling; Quantum gases; Rashba spin-orbit coupling; Strongly correlated phases; Exact diagonalization; Dynamical simulations; Collective excitations; Mean-field theory
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Balasubramanian, R. (2014). Rashba Spin-Orbit Coupled Quantum Gases. (Doctoral Dissertation). Rice University. Retrieved from http://hdl.handle.net/1911/76345
Chicago Manual of Style (16th Edition):
Balasubramanian, Ramachandhran. “Rashba Spin-Orbit Coupled Quantum Gases.” 2014. Doctoral Dissertation, Rice University. Accessed January 23, 2021.
http://hdl.handle.net/1911/76345.
MLA Handbook (7th Edition):
Balasubramanian, Ramachandhran. “Rashba Spin-Orbit Coupled Quantum Gases.” 2014. Web. 23 Jan 2021.
Vancouver:
Balasubramanian R. Rashba Spin-Orbit Coupled Quantum Gases. [Internet] [Doctoral dissertation]. Rice University; 2014. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/1911/76345.
Council of Science Editors:
Balasubramanian R. Rashba Spin-Orbit Coupled Quantum Gases. [Doctoral Dissertation]. Rice University; 2014. Available from: http://hdl.handle.net/1911/76345

University of Minnesota
14.
Liang, Zhaoxin.
Design, Simulation, and Optimization of Spintronic Logic Devices.
Degree: PhD, Electrical Engineering, 2019, University of Minnesota
URL: http://hdl.handle.net/11299/202437
► Over the past 50 years, complementary metal-oxide-semiconductor (CMOS) technology has developed aggressively and has undergone continuous scaling, as described by to Moore's Law. However, as…
(more)
▼ Over the past 50 years, complementary metal-oxide-semiconductor (CMOS) technology has developed aggressively and has undergone continuous scaling, as described by to Moore's Law. However, as transistor feature sizes approach the nanometer scale, there have been growing concerns with escalated power dissipation issues in very large scale integrated (VLSI) circuits, as well as device performance/reliability issues under process variations and aging. Meanwhile, emerging consumer electronic markets such as mobile and distributed computing, the internet of things, and autonomous driving platforms have posed various new challenges for the reliability and performance of electronic systems. While mainstream efforts have pushed forward scaling in CMOS technologies, there has been growing research interest in search for replacements for CMOS. Such efforts involve conceptualizing computational devices, based on new physics principles and new materials, that could serve as fundamental building blocks for new architectures, providing diversified computational functionality and offering better performance than the traditional CMOS-based paradigm. Among these beyond-CMOS technologies, spintronics is one of the most promising candidates for building next-generation logic devices. Spintronics takes advantage of an intrinsic property of electrons, spin, and develops the concept of state based on magnetism, which is a physical manifestation of electron spin. However, this new technology requires new simulation frameworks and design methods to be developed and deployed in order to propose and evaluate the potential of new spin-based devices, accounting for the impact of novel material properties that dictate the performance of these devices. Such frameworks can further be employed in determining the dependence of circuit performance on material and device parameters, and in optimizing these new technologies. The first part of the thesis provides a brief review of spintronics and explains a set of physical effects that are exploited to build spintronics-based devices descried in the later chapters. These include spin transfer torque (STT), which forms the basis for early spin-based logic devices, with its associated concepts of spin polarized current and non-local spin valve structure; the magnetoelectric (ME) coupling effect that provides low power and fast switching of magnetization in a ferromagnet (FM) with multiferroic material stacks; domain wall (DW) structures in FMs that can be used for logic transfer; and inverse spin orbit coupling (ISOC) effects, which offer convenient conversion between spin and charge states. The second part of the thesis develops performance optimization techniques for all-spin logic (ASL) devices. A framework for simulating ASL devices is first described, and a method for performance optimization through device sizing is developed. An algorithm for optimal device sizing, based on the geometrical dependence of the energy and delay for the ASL device, is then developed. The results of optimization on…
Subjects/Keywords: all spin logic; logic device; magnetoelectric coupling effect; spin orbit coupling effect; spin transfer torque switching; Spintronics
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Liang, Z. (2019). Design, Simulation, and Optimization of Spintronic Logic Devices. (Doctoral Dissertation). University of Minnesota. Retrieved from http://hdl.handle.net/11299/202437
Chicago Manual of Style (16th Edition):
Liang, Zhaoxin. “Design, Simulation, and Optimization of Spintronic Logic Devices.” 2019. Doctoral Dissertation, University of Minnesota. Accessed January 23, 2021.
http://hdl.handle.net/11299/202437.
MLA Handbook (7th Edition):
Liang, Zhaoxin. “Design, Simulation, and Optimization of Spintronic Logic Devices.” 2019. Web. 23 Jan 2021.
Vancouver:
Liang Z. Design, Simulation, and Optimization of Spintronic Logic Devices. [Internet] [Doctoral dissertation]. University of Minnesota; 2019. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/11299/202437.
Council of Science Editors:
Liang Z. Design, Simulation, and Optimization of Spintronic Logic Devices. [Doctoral Dissertation]. University of Minnesota; 2019. Available from: http://hdl.handle.net/11299/202437

NSYSU
15.
Lin, Tzu-Chen.
Orbital Hall effect in k-linear spin-orbit coupled semiconductor systems.
Degree: Master, Physics, 2014, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0611114-212353
► The effective conserved orbital current is composed of the conventional orbital current and the torque orbital current. We use Kubo formula and analytically calculate the…
(more)
▼ The effective conserved orbital current is composed of the conventional orbital current and the torque orbital current. We use Kubo formula and analytically calculate the intrinsic orbital Hall conductivity in the generic k-linear
spin-
orbit coupling semiconductor systems. We find that the magnitude of the conventional orbital - Hall conductivity depends on the orientation of the system. Further, when the torque orbital Hall conductivity is considered, the resulting absolute value of the total orbital - Hall conductivity reaches a maximum when the orbital current occurs in the direction with the smallest band splitting.
Advisors/Committee Members: Tsung-Wei Chen (committee member), Shiow-Fon Tsay (chair), Chong-Der Hu (chair), Wang-Chuang Kuo (chair), Tsung-Wei Chen (chair).
Subjects/Keywords: Hall conductivity; orbital angular momentum; spin-orbit coupling; spintronics; orbitronics
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lin, T. (2014). Orbital Hall effect in k-linear spin-orbit coupled semiconductor systems. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0611114-212353
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lin, Tzu-Chen. “Orbital Hall effect in k-linear spin-orbit coupled semiconductor systems.” 2014. Thesis, NSYSU. Accessed January 23, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0611114-212353.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lin, Tzu-Chen. “Orbital Hall effect in k-linear spin-orbit coupled semiconductor systems.” 2014. Web. 23 Jan 2021.
Vancouver:
Lin T. Orbital Hall effect in k-linear spin-orbit coupled semiconductor systems. [Internet] [Thesis]. NSYSU; 2014. [cited 2021 Jan 23].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0611114-212353.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lin T. Orbital Hall effect in k-linear spin-orbit coupled semiconductor systems. [Thesis]. NSYSU; 2014. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0611114-212353
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of California – Riverside
16.
Lin, Zhisheng.
Charge and Spin Transport in Graphene Heterostructures and Cr2Ge2Te6.
Degree: Physics, 2017, University of California – Riverside
URL: http://www.escholarship.org/uc/item/2pt4q4pv
► This dissertation summarizes my past work on hydrogenation of graphene, development of Al2O3 tunnel barrier, pressure effects on Cr2Ge2Te6 (CGT), and proximity effects in graphene/WSe2…
(more)
▼ This dissertation summarizes my past work on hydrogenation of graphene, development of Al2O3 tunnel barrier, pressure effects on Cr2Ge2Te6 (CGT), and proximity effects in graphene/WSe2 heterostructures. There are three main parts. The first part is the study of hydrogenation of graphene and the development of atomically smooth Al2O3 tunnel barrier. Graphene device is coated with hydrogen silsesquioxane (HSQ) resist and exposed with electron beam. Graphene is hydrogenated by forming the covalently bonds to the hydrogen atoms and transforms from sp2 to sp3 bonds. By breaking the inversion symmetry perpendicular to the graphene plane, Rashba spin orbit coupling (SOC) is enhanced. We characterized the hydrogenation effects by performing Raman spectroscopy measurements. A clear D and D’ peak grow abruptly with small hydrogenation dosage and keep growing with higher dosage, indicating the increased defects density in graphene. Electrical transport properties are characterized by measuring the gate voltage dependence at different hydrogenation percentages: mobility decreases and graphene becomes more electron-doped upon hydrogenation. The hydrogenation process is reversible, which means the hydrogenation effects are almost gone after annealing. Nonlocal resistivity is 1 to 3 orders of magnitude larger than that of the pristine graphene, which cannot be accounted for by the ohmic contribution assuming uniform graphene channel. The problems of nonlocal measurement method are discussed. The rest of first part is focused on developing the atomically smooth Al2O3 tunnel barrier by sputtering a thin layer of aluminum first and oxidizing it in O2 atmosphere.The second part is about the pressure effects on the magnetic anisotropy of CGT. Magnetoresistance of CGT bulk crystal is measured under applied hydrostatic pressures up to 2 GPa. Upon the application of hydrostatic pressure, we observe an induced transition of easy axis from c axis to the ab plane of the crystal. Furthermore, we observe a reduction of the band gap of CGT by approximately 0.066 eV once the applied pressure reaches 2 GPa. We verify that the magnetoresistance (MR) change originates from anisotropic magnetoresistance (AMR) by measuring the temperature dependence of MR below and above Curie temperature (TC) under the different applied pressures.The last part is focused on the proximity effects in bilayer graphene/WSe2 heterostructures and the pressure induced insulating behavior. The enhancement of spin- orbit coupling is verified by observing the weak-anti localization for the graphene region covered with WSe2 but the weak localization (WL) for the uncovered region. The Rashba SOC strength value extracted from the weak-antilocalization (WAL) fitting is about 1 meV while the intrinsic SOC in graphene is about tens of µeV. It increases by more than two orders of magnitude. Graphene covered with WSe2 shows a strong insulating behavior by applying pressure and the insulating behavior is stronger under higher pressure, which is a signature of a band gap opening. Two…
Subjects/Keywords: Condensed matter physics; graphene; spin orbit coupling; spintronics
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APA (6th Edition):
Lin, Z. (2017). Charge and Spin Transport in Graphene Heterostructures and Cr2Ge2Te6. (Thesis). University of California – Riverside. Retrieved from http://www.escholarship.org/uc/item/2pt4q4pv
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lin, Zhisheng. “Charge and Spin Transport in Graphene Heterostructures and Cr2Ge2Te6.” 2017. Thesis, University of California – Riverside. Accessed January 23, 2021.
http://www.escholarship.org/uc/item/2pt4q4pv.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lin, Zhisheng. “Charge and Spin Transport in Graphene Heterostructures and Cr2Ge2Te6.” 2017. Web. 23 Jan 2021.
Vancouver:
Lin Z. Charge and Spin Transport in Graphene Heterostructures and Cr2Ge2Te6. [Internet] [Thesis]. University of California – Riverside; 2017. [cited 2021 Jan 23].
Available from: http://www.escholarship.org/uc/item/2pt4q4pv.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lin Z. Charge and Spin Transport in Graphene Heterostructures and Cr2Ge2Te6. [Thesis]. University of California – Riverside; 2017. Available from: http://www.escholarship.org/uc/item/2pt4q4pv
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of California – Santa Cruz
17.
Trinh, Jennifer.
Low temperature properties of strong spin-orbit systems.
Degree: Physics, 2016, University of California – Santa Cruz
URL: http://www.escholarship.org/uc/item/18b127t2
► Spin-orbit coupling (SOC) is a relativistic interaction between the electronic spin and orbital degrees of freedom. The SOC can give rise to a variety of…
(more)
▼ Spin-orbit coupling (SOC) is a relativistic interaction between the electronic spin and orbital degrees of freedom. The SOC can give rise to a variety of interesting phenomena, most notably at low temperatures in compounds composed of large-Z (atomic number) elements, since the SOC scales as Z4. In this dissertation, I examine the low-temperature expression of SOC in the transport and magnetic properties of a representative selection of materials, including the heavy fermion system URu2Si2, narrow band gap semiconductor FeSb2, 5d transition metal oxide BaIrO3, linear band CoSb3 and RhSb3 skutterudites, as well as a new class of rare earth materials on a novel kagome lattice with non-collinear Ising axes, called the “tripod” kagome lattice. These compounds all feature unusual many-body properties that are either directly or indirectly linked to the large SOC present in each. In URu2Si2, for example, the large SOC is foundational to the hidden order (HO) phase that arises at THO = 17.5 K, where a remarkable magnetic signature is seen not in the linear magnetic susceptibility, χ1, but in the leading nonlinear term χ3. Exotic magnetic ground states are also seen in the newly synthesized rare earth tripod kagome systems. The SOC is also an important component of the inverted band structure in Dirac materials, and thus plays a role in the band formation of CoSb3 and RhSb3, which have both been predicted to be near a topological transition. Finally, large SOC may also be related to interesting carrier dynamics in FeSb2 and BaIrO3: FeSb2 displays a unique proportionality between the thermopower, S(T), and Hall mobility, μH (T), while BaIrO3 exhibits a non-saturating positive linear magnetoresistance, despite ferromagnetic order, which usually results in a negative saturating magnetoresistance. These examples showcase the importance of SOC across a range of strongly correlated phenomena spanning itinerant to localized electronic degrees of freedom.
Subjects/Keywords: Physics; low temperature physics; magnetransport; spin-orbit coupling
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Trinh, J. (2016). Low temperature properties of strong spin-orbit systems. (Thesis). University of California – Santa Cruz. Retrieved from http://www.escholarship.org/uc/item/18b127t2
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Trinh, Jennifer. “Low temperature properties of strong spin-orbit systems.” 2016. Thesis, University of California – Santa Cruz. Accessed January 23, 2021.
http://www.escholarship.org/uc/item/18b127t2.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Trinh, Jennifer. “Low temperature properties of strong spin-orbit systems.” 2016. Web. 23 Jan 2021.
Vancouver:
Trinh J. Low temperature properties of strong spin-orbit systems. [Internet] [Thesis]. University of California – Santa Cruz; 2016. [cited 2021 Jan 23].
Available from: http://www.escholarship.org/uc/item/18b127t2.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Trinh J. Low temperature properties of strong spin-orbit systems. [Thesis]. University of California – Santa Cruz; 2016. Available from: http://www.escholarship.org/uc/item/18b127t2
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University
18.
Cai, Han.
Superradiance and Topological Quantum Optics in Atomic Medium and Cavity QED.
Degree: PhD, Physics, 2017, Texas A&M University
URL: http://hdl.handle.net/1969.1/173128
► In this dissertation we focused on two topics: 1. atomic cooperative effect, including superradiance, subradiance and collective Lamb shift in an atomic ensemble; 2. novel…
(more)
▼ In this dissertation we focused on two topics: 1. atomic cooperative effect, including superradiance, subradiance and collective Lamb shift in an atomic ensemble; 2. novel topological effect in quantum optics system, such as Haldane model, synthetic magnetic field in superradiance lattice and synthetic
spin-
orbit interaction in Fock-state lattices.
In the first part, we start from the Dicke state, an N-particle atomic ensemble excited by a single photon. Due to the interaction of the atoms with a continuum of vacuum modes, the Dicke state has a larger decay rate compared with an isolated atom, termed the single photon superradiance. In the “opposite” case, the single-photon subradiance state does not decay because of the destructive interference of the atomic transitions. We study the protection of subradiant states by the symmetry of the atomic distributions in the Dicke limit, in which collective Lamb shifts cannot be neglected. We find that antisymmetric states are subradiant states for distributions with reflection symmetry. Continuous symmetry can also be used to achieve subradiance in an extended ensemble. This study is relevant to the problem of robust quantum memory with long storage time and fast readout.
In the second part, we start from introducing the concepts, methods, and models from quantum optics or condensed matter physics. They include the timed-Dicke states, electromagnetically induced transparency, coupled wave equations, tight-binding model, band theory, Floquet theory, superradiance lattice, integer quantum Hall effect, Haldane model, etc.. Based upon these tools, we study three topological quantum optics systems: (i) a Haldane model with in situ tunable topological properties in a two-dimensional momentumspace superradiance lattice composed of timed Dicke states in electromagnetically induced transparency; (ii) a
spin-
orbit coupled Fock-state lattice, which introduce a novel quantum operation to generate mesoscopic superposition states, e.g., the NOON states and cat states; (iii) a synthetic magnetic field created in a quasi one dimensional superradiance lattice, which is predicted to be observed in thermal vapours of alkali atoms instead of only in cold atoms (as in previous experiments). This study aims to provide a novel, highly tunable platform simulating exotic phenomena in condensed matter physics and offers a basis of topological quantum optics and novel photonic devices.
Advisors/Committee Members: Scully, Marlan O (advisor), Fry, Edward S (committee member), Hemmer, Philip R (committee member), Sokolov, Alexei V (committee member), Suhail Zubairy, Muhammad (committee member).
Subjects/Keywords: superradiance; superradiance lattice; topological phase; Haldane model; spin-orbit coupling
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Cai, H. (2017). Superradiance and Topological Quantum Optics in Atomic Medium and Cavity QED. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/173128
Chicago Manual of Style (16th Edition):
Cai, Han. “Superradiance and Topological Quantum Optics in Atomic Medium and Cavity QED.” 2017. Doctoral Dissertation, Texas A&M University. Accessed January 23, 2021.
http://hdl.handle.net/1969.1/173128.
MLA Handbook (7th Edition):
Cai, Han. “Superradiance and Topological Quantum Optics in Atomic Medium and Cavity QED.” 2017. Web. 23 Jan 2021.
Vancouver:
Cai H. Superradiance and Topological Quantum Optics in Atomic Medium and Cavity QED. [Internet] [Doctoral dissertation]. Texas A&M University; 2017. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/1969.1/173128.
Council of Science Editors:
Cai H. Superradiance and Topological Quantum Optics in Atomic Medium and Cavity QED. [Doctoral Dissertation]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/173128

Texas A&M University
19.
Liu, Xin.
Spin Dynamics in the Presence of Spin-orbit Interactions: from the Weak to the Strong Spin-orbit Coupling Regime.
Degree: PhD, Physics, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11703
► We study the spin dynamics in a high-mobility two dimensional electron gas (2DEG) system with generic spin-orbit interactions (SOIs). We derive a set of spin…
(more)
▼ We study the
spin dynamics in a high-mobility two dimensional electron gas (2DEG) system with generic
spin-
orbit interactions (SOIs).
We derive a set of
spin dynamic equations which capture the purely exponential to the damped oscillatory
spin evolution modes
observed in different regimes of SOI strength.
Hence we provide a full treatment of the D'yakonov-Perel's mechanism by using the microscopic linear response theory from the
weak to the strong SOI limit. We show that the damped oscillatory modes appear when the electron scattering time is larger than half of the
spin precession time due to the SOI, in agreement with recent observations. We propose a new way to measure the scattering time and the relative strength of Rashba and linear Dresselhaus SOIs based on these modes and optical grating experiments. We discuss the physical interpretation of each of these modes in the context of Rabi oscillation.
In the finite temperature, We study the
spin dynamics in the presence of impurity and electron-electron (e-e) scattering in a III-V semiconductor quantum well. Starting from the Keldysh formalism, we develop the
spin-charge dynamic equation at finite temperature in the presence of inelastic scattering which provide a new approach to describe the
spin relaxation from the weak to the strong
spin-
orbit coupling (SOC) regime. In the weak SOC regime, our theory shows that when the system is near the SU(2) symmetry point, because the
spin relaxation due to DP mechanism is suppressed dramatically, the
spin relaxation is dominated by the Elliott-Yafet (EY) mechanism in a wide temperature regime. The non-monotonic temperature dependence of enhanced-lifetime of
spin helix mode is due to the competition between the DP and EY mechanisms. In the strong SOC regime, the our theory is consistent to the previous theoretical results at zero temperature.
Advisors/Committee Members: Sinova, Jairo (advisor), Abanov, Artem (committee member), Belyanin, Alexey (committee member), Teizer, Winfried (committee member), Eknoyan, Ohannes (committee member).
Subjects/Keywords: strong Spin-orbit coupling; Dyaknov-Perel; Elliott-Yafet
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Liu, X. (2012). Spin Dynamics in the Presence of Spin-orbit Interactions: from the Weak to the Strong Spin-orbit Coupling Regime. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11703
Chicago Manual of Style (16th Edition):
Liu, Xin. “Spin Dynamics in the Presence of Spin-orbit Interactions: from the Weak to the Strong Spin-orbit Coupling Regime.” 2012. Doctoral Dissertation, Texas A&M University. Accessed January 23, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11703.
MLA Handbook (7th Edition):
Liu, Xin. “Spin Dynamics in the Presence of Spin-orbit Interactions: from the Weak to the Strong Spin-orbit Coupling Regime.” 2012. Web. 23 Jan 2021.
Vancouver:
Liu X. Spin Dynamics in the Presence of Spin-orbit Interactions: from the Weak to the Strong Spin-orbit Coupling Regime. [Internet] [Doctoral dissertation]. Texas A&M University; 2012. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11703.
Council of Science Editors:
Liu X. Spin Dynamics in the Presence of Spin-orbit Interactions: from the Weak to the Strong Spin-orbit Coupling Regime. [Doctoral Dissertation]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11703

University of California – Berkeley
20.
Yi, Di.
Engineering the Magnetoelectric Coupling in Complex Oxides Heterostructures.
Degree: Materials Science & Engineering, 2015, University of California – Berkeley
URL: http://www.escholarship.org/uc/item/0w1689t5
► Multiferroic magnetoelectric (ME) materials, which simultaneously show ferroelectricity and magnetic ordering, have attracted a huge scientific attention due to both the intriguing fundamental importance and…
(more)
▼ Multiferroic magnetoelectric (ME) materials, which simultaneously show ferroelectricity and magnetic ordering, have attracted a huge scientific attention due to both the intriguing fundamental importance and the great technological potential, as a result of the coupling between the dual ferroic orderings. However there are only a few single-phase multiferroic materials in nature and the performance is limited by the low ordering temperature, the small polarization/magnetization or the weak coupling efficiency. Another promising pathway to engineer ME coupling is through designing heterostructures. The current studies of ME coupling (electric field control of magnetism) in heterostructures can be divided into 3 routes: (1) Using piezoelectric effects to change the strain (lattice); (2) Using ferroelectric polarization to tune the carriers (charge); (3) Using multiferroic materials to manipulate the moments by magnetic coupling (spin). Previous studies of an all-oxide model heterostructure system that consists of the ferromagnet La0.7Sr0.3MnO3 (LSMO) and the BiFeO3 (BFO) reveals an interesting charge and spin interactions at the interface. Following the same route, the first part of the dissertation focuses on two different pathways to improve the ME coupling in manganite/BFO model system. Chapter 3 demonstrates that the ME coupling in LSMO/BFO is dramatically different by changing the atomic stack-ing sequence at the interface. In chapter 4, another model system La0.5Ca0.5MnO3 (LCMO), which is at the ferromagnetic/antiferromagnetic phase boundary, is studied instead of LSMO to explore the limit within this route. The results complementarily suggest the importance of a more comprehensive design rule at the atomic scale in order to achieve a better ME coupling efficiency. Furthermore, although the coupling between the lattice, charge and spin has been intensively studied in terms of ME coupling, the orbital degree of freedom has been neglected so far. In principle, orbital is strongly coupled to lattice. Therefore a large ME coupling could be expected if a strong spin-orbit interaction could be established. The second part of the dissertation concentrates on pursuing this new ideal through two different pathways. Chapter 5 presents a systematic study of the in-situ strain effect on the magnetic and orbital orderings of a model system Nd0.5Sr0.5MnO3. The results demonstrate the close correlation between the orbital ordering parameter and the strain. However the magnetic ordering parameter is less sensitive to strain in this system. With the implication from chapter 5, 5d transition metal oxide SrIrO3(SIO), which hosts a strong intrinsic spin-orbit coupling due to the large atomic number, is studied in chapter 6. Superlattice LSMO/SIO shows an interesting novel magnetic state with a large orbital momentum in the nominally paramagnetic SIO, which is likely to be a very promising candidate to engineer the ME coupling at the interface. In summary, our studies on engineering the ME effects in heterostructures have revealed two key…
Subjects/Keywords: Materials Science; Complex Oxides; Interface; Magnetism; Magnetoelectric; Multiferroic; Spin-orbit coupling
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Yi, D. (2015). Engineering the Magnetoelectric Coupling in Complex Oxides Heterostructures. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/0w1689t5
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Yi, Di. “Engineering the Magnetoelectric Coupling in Complex Oxides Heterostructures.” 2015. Thesis, University of California – Berkeley. Accessed January 23, 2021.
http://www.escholarship.org/uc/item/0w1689t5.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Yi, Di. “Engineering the Magnetoelectric Coupling in Complex Oxides Heterostructures.” 2015. Web. 23 Jan 2021.
Vancouver:
Yi D. Engineering the Magnetoelectric Coupling in Complex Oxides Heterostructures. [Internet] [Thesis]. University of California – Berkeley; 2015. [cited 2021 Jan 23].
Available from: http://www.escholarship.org/uc/item/0w1689t5.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Yi D. Engineering the Magnetoelectric Coupling in Complex Oxides Heterostructures. [Thesis]. University of California – Berkeley; 2015. Available from: http://www.escholarship.org/uc/item/0w1689t5
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Boston College
21.
Dally, Rebecca Lynn.
The implications of geometric frustration and orbital
degeneracies on the evolution of magnetism in Na4Ir3O8 and
α-NaMnO2.
Degree: PhD, Physics, 2018, Boston College
URL: http://dlib.bc.edu/islandora/object/bc-ir:108108
► Spin-orbit intertwined order gives rise to many novel phenomena with a broad phase space spanned by the competing energy scales within a system. This dissertation…
(more)
▼ Spin-
orbit intertwined order gives rise to many novel
phenomena with a broad phase space spanned by the competing energy
scales within a system. This dissertation synthesized and studied
two such systems demonstrating different manifestations of
spin-
orbit interactions, originating from orbital degeneracy
effects, on geometrically frustrated magnetic lattices. Firstly,
strong
spin-
orbit coupling in the hyperkagome lattice, Na4Ir3O8,
and secondly, the layered material, α-NaMnO2, where single-ion
anisotropy and a cooperative Jahn-Teller distortion drive magnetism
to the quasi-1D limit. The magnetic ground state of the Jeff = 1/2
spin-liquid candidate, Na4Ir3O8, is explored via combined bulk
magnetization, muon
spin relaxation, and neutron scattering
measurements. A short-range, frozen, state comprised of
quasi-static moments develops below a characteristic temperature of
TF = 6 K, revealing an inhomogeneous distribution of spins
occupying the entirety of the sample volume. Quasi-static,
short-range,
spin correlations persist until at least 20 mK and
differ substantially from the nominally dynamic response of a
quantum
spin liquid. Much of this dissertation focuses on the
second
spin-
orbit intertwined system, α-NaMnO2, where a cooperative
Jahn-Teller distortion of the MnO6 octahedra arising from an
orbital degeneracy in the Mn3+ cations directly affects the
electronic (ferro-orbital) and magnetic (antiferromagnetic) order,
which results in an intriguing study of low-dimensional magnetism.
Intricacies of the structure, static magnetic order, and magnon
dynamics are presented, which heavily relied on neutron scattering
techniques. In particular, a longitudinally polarized bound magnon
mode is characterized through the use of polarized neutron
scattering.
Advisors/Committee Members: Stephen D. Wilson (Thesis advisor).
Subjects/Keywords: antiferromagnets; condensed matter physics; geometric frustration; neutron scattering; spin-orbit coupling
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Dally, R. L. (2018). The implications of geometric frustration and orbital
degeneracies on the evolution of magnetism in Na4Ir3O8 and
α-NaMnO2. (Doctoral Dissertation). Boston College. Retrieved from http://dlib.bc.edu/islandora/object/bc-ir:108108
Chicago Manual of Style (16th Edition):
Dally, Rebecca Lynn. “The implications of geometric frustration and orbital
degeneracies on the evolution of magnetism in Na4Ir3O8 and
α-NaMnO2.” 2018. Doctoral Dissertation, Boston College. Accessed January 23, 2021.
http://dlib.bc.edu/islandora/object/bc-ir:108108.
MLA Handbook (7th Edition):
Dally, Rebecca Lynn. “The implications of geometric frustration and orbital
degeneracies on the evolution of magnetism in Na4Ir3O8 and
α-NaMnO2.” 2018. Web. 23 Jan 2021.
Vancouver:
Dally RL. The implications of geometric frustration and orbital
degeneracies on the evolution of magnetism in Na4Ir3O8 and
α-NaMnO2. [Internet] [Doctoral dissertation]. Boston College; 2018. [cited 2021 Jan 23].
Available from: http://dlib.bc.edu/islandora/object/bc-ir:108108.
Council of Science Editors:
Dally RL. The implications of geometric frustration and orbital
degeneracies on the evolution of magnetism in Na4Ir3O8 and
α-NaMnO2. [Doctoral Dissertation]. Boston College; 2018. Available from: http://dlib.bc.edu/islandora/object/bc-ir:108108

Rice University
22.
Zhu, Chuanzhou.
Novel Spin-orbit Coupling in Cold Atoms.
Degree: PhD, Natural Sciences, 2020, Rice University
URL: http://hdl.handle.net/1911/107990
► In cold atom, the coupling between "spin" (atomic internal hyperfine states) and "orbit" (atomic center-of-mass motion) can be induced by Raman transition, where different hyperfine…
(more)
▼ In cold atom, the
coupling between "
spin" (atomic internal hyperfine states) and "
orbit" (atomic center-of-mass motion) can be induced by Raman transition, where different hyperfine states are coupled by a pair of Raman lasers. In recent years, this synthetic
spin-
orbit coupling has received tremendous attention, as it leads to a variety of novel quantum phenomena in precisely controllable cold atom systems.
In this thesis, we first present a comprehensive analysis of one-, two- and many- particle physics of harmonically trapped atoms with
spin-
orbit coupling, followed by the study of "novel
spin-
orbit coupling" in two different systems: (1) cold atom spinor mixtures and (2) cold atoms in an optical cavity. In the first system, we consider a spinor mixture consisting of two species of cold atoms, where the
spin-
orbit coupling can be transmitted from one species to the other, and we discuss novel topological properties and the supersolid stripe phase in this mixture. In the second system, we consider the
coupling among three parts: the cavity photon field, the atomic internal hyperfine states, and the atomic external center-of-mass motion, and we discuss how this
coupling affects familiar quantum optical phenomena, such as Rabi oscillation and Dicke superradiance phase transition. Our novel systems contribute new and practical platforms for the research field of synthetic
spin-
orbit coupling in cold atoms.
Advisors/Committee Members: Pu, Han (advisor).
Subjects/Keywords: theoretical physics; cold atom physics; quantum optics; synthetic spin-orbit coupling
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Zhu, C. (2020). Novel Spin-orbit Coupling in Cold Atoms. (Doctoral Dissertation). Rice University. Retrieved from http://hdl.handle.net/1911/107990
Chicago Manual of Style (16th Edition):
Zhu, Chuanzhou. “Novel Spin-orbit Coupling in Cold Atoms.” 2020. Doctoral Dissertation, Rice University. Accessed January 23, 2021.
http://hdl.handle.net/1911/107990.
MLA Handbook (7th Edition):
Zhu, Chuanzhou. “Novel Spin-orbit Coupling in Cold Atoms.” 2020. Web. 23 Jan 2021.
Vancouver:
Zhu C. Novel Spin-orbit Coupling in Cold Atoms. [Internet] [Doctoral dissertation]. Rice University; 2020. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/1911/107990.
Council of Science Editors:
Zhu C. Novel Spin-orbit Coupling in Cold Atoms. [Doctoral Dissertation]. Rice University; 2020. Available from: http://hdl.handle.net/1911/107990

Victoria University of Wellington
23.
Gühne, Robin.
Electronic properties of the topological insulators Bi₂Se₃ and Bi₂Te₃.
Degree: 2020, Victoria University of Wellington
URL: http://hdl.handle.net/10063/8643
► The three-dimensional topological insulators Bi₂Se₃ and Bi₂Te₃ are model systems of a new class of materials with an insulating bulk and gapless surface states. Their…
(more)
▼ The three-dimensional topological insulators Bi₂Se₃ and Bi₂Te₃ are model systems of a new class of materials with an insulating bulk and gapless surface states. Their small band gaps and the heavy elements are essential for the topologically non-trivial band structure, but these features are similarly responsible for other remarkable properties, such as their high thermoelectric performance.
This thesis investigates the electronic properties of the topological insulators Bi₂Se₃ and Bi₂Te₃ with a broad range of experimental methods. Ferromagnetism in Mn doped Bi₂Te₃ is shown to disappear under sample sintering. A surprisingly large magnetoresistance and a charge carrier independent change in the sign of the thermopower with increasing Mn content are discussed.¹²⁵Te nuclear magnetic resonance (NMR) of Bi₂Te₃ single crystals suggest an unusual electronic
spin susceptibility and complex NMR shifts. The quadrupole interaction of ²⁰⁹Bi nuclei in Bi₂Se₃ single crystals is shown to be a signature of the band inversion in quantitative agreement with first-principle calculations. Furthermore, it is proposed that the strong
spin-
orbit coupling of conduction electrons causes a non-trivial orientation dependent quadrupole splitting of the ²⁰⁹Bi resonance.
Advisors/Committee Members: Williams, Grant, Chong, Shen.
Subjects/Keywords: Topological insulator; Magnetoresistance; Band inversion; Spin-orbit coupling; Defects
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APA (6th Edition):
Gühne, R. (2020). Electronic properties of the topological insulators Bi₂Se₃ and Bi₂Te₃. (Doctoral Dissertation). Victoria University of Wellington. Retrieved from http://hdl.handle.net/10063/8643
Chicago Manual of Style (16th Edition):
Gühne, Robin. “Electronic properties of the topological insulators Bi₂Se₃ and Bi₂Te₃.” 2020. Doctoral Dissertation, Victoria University of Wellington. Accessed January 23, 2021.
http://hdl.handle.net/10063/8643.
MLA Handbook (7th Edition):
Gühne, Robin. “Electronic properties of the topological insulators Bi₂Se₃ and Bi₂Te₃.” 2020. Web. 23 Jan 2021.
Vancouver:
Gühne R. Electronic properties of the topological insulators Bi₂Se₃ and Bi₂Te₃. [Internet] [Doctoral dissertation]. Victoria University of Wellington; 2020. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/10063/8643.
Council of Science Editors:
Gühne R. Electronic properties of the topological insulators Bi₂Se₃ and Bi₂Te₃. [Doctoral Dissertation]. Victoria University of Wellington; 2020. Available from: http://hdl.handle.net/10063/8643

University of Toronto
24.
Venkataraman, Vijay Shankar.
Perspectives from Ab-initio and Tight-binding: Applications to Transition Metal Compounds and Superlattices.
Degree: PhD, 2016, University of Toronto
URL: http://hdl.handle.net/1807/73205
► The experimental and theoretical study of transition metal compounds have occupied condensed matter physicists for the best part of the last century. The rich variety…
(more)
▼ The experimental and theoretical study of transition metal compounds have occupied condensed matter physicists for the best part of the last century. The rich variety of physical behaviour exhibited by these compounds owes its origin to the subtle balance of the energy scales at play for the d orbitals. In this thesis, we study three different systems comprised of transition metal atoms from the third, the fourth, and the fifth group of the periodic table using a combination of \emph{ab-initio} density functional theory (DFT) computations and effective tight-binding models for the electronic properties.
We first consider the electronic properties of artificially fabricated perovskite superlattices of the form [(\ce{SrIrO3})
m / \ce{SrTiO3}] with integer m denoting the number of layers of \ce{SrIrO3}. After discussing the results of experiments undertaken by our collaborators, we present the results of our DFT calculations and build tight-binding models for the m=1 and m=2 superlattices. The active ingredient is found to be the \ce{Ir} 5d orbitals with significant
spin-
orbit coupling. We then study the energies of magnetic ground states within DFT and compare and contrast our results with those obtained for the bulk Ruddlesden-Popper iridates. Together with experimental measurements, our results suggest that these superlattices are an exciting venue to probe the magnetism and metal-insulator transitions that occur from the intricate balance of the
spin-
orbit coupling and electron interactions, as has been reported for their bulk counterparts.
Next, we consider α-\ce{RuCl3}, a honeycomb lattice compound. We first show using DFT calculations in conjunction with experiments performed by our collaborators, how
spin-
orbit coupling in the 4d orbitals of \ce{Ru} is essential to understand the insulating state realized in this compound. Then, in the latter half of the chapter, we study the magnetic ground states of a two-dimensional analogue of α-\ce{RuCl3} in weak and strong-
coupling regimes obtained from a tight-binding model for the 4d orbitals. We further compare these results with energies obtained from DFT calculations. We obtain a zig-zag magnetic ground state for this compound, in all the three approaches. Within DFT, we find that correlations enhance the
spin-
orbit coupling in this compound and that the anisotropic Kitaev interactions between the spins are dominant in a strong-
coupling model.
Then, we move on to study the electronic band structures of the higher manganese silicides, which are good thermoelectric materials. Using results from DFT calculations on \ce{Mn4Si7} and structural arguments, we construct an effective tight-binding model for the first three members of this series - \ce{Mn4Si7}, \ce{Mn11Si19}, and \ce{Mn15Si26}.
Advisors/Committee Members: Kee, Hae-Young, Physics.
Subjects/Keywords: density functional theory; magnetism; spin-orbit coupling; strongly correlated systems; 0611
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Venkataraman, V. S. (2016). Perspectives from Ab-initio and Tight-binding: Applications to Transition Metal Compounds and Superlattices. (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/73205
Chicago Manual of Style (16th Edition):
Venkataraman, Vijay Shankar. “Perspectives from Ab-initio and Tight-binding: Applications to Transition Metal Compounds and Superlattices.” 2016. Doctoral Dissertation, University of Toronto. Accessed January 23, 2021.
http://hdl.handle.net/1807/73205.
MLA Handbook (7th Edition):
Venkataraman, Vijay Shankar. “Perspectives from Ab-initio and Tight-binding: Applications to Transition Metal Compounds and Superlattices.” 2016. Web. 23 Jan 2021.
Vancouver:
Venkataraman VS. Perspectives from Ab-initio and Tight-binding: Applications to Transition Metal Compounds and Superlattices. [Internet] [Doctoral dissertation]. University of Toronto; 2016. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/1807/73205.
Council of Science Editors:
Venkataraman VS. Perspectives from Ab-initio and Tight-binding: Applications to Transition Metal Compounds and Superlattices. [Doctoral Dissertation]. University of Toronto; 2016. Available from: http://hdl.handle.net/1807/73205

Georgia Tech
25.
Han, Li.
Spin-orbit coupled ultracold fermions.
Degree: PhD, Physics, 2014, Georgia Tech
URL: http://hdl.handle.net/1853/52314
► In this Thesis we discussed ultracold Fermi gas with an s-wave interaction and synthetic spin-orbit coupling under a variety of conditions. We considered the system…
(more)
▼ In this Thesis we discussed ultracold Fermi gas with an s-wave interaction and synthetic
spin-
orbit coupling under a variety of conditions. We considered the system in both three and two spatial dimensions, with equal-Rashba-Dresselhaus type or Rashba-only type of
spin-
orbit-
coupling, and with or without an artificial Zeeman field. We found competing effects on Fermionic superfluidity from
spin-
orbit coupling and Zeeman fields, and topologically non-trivial states in the presence of both fields. We gave an outlook on the many-body physics in the last.
Advisors/Committee Members: S� de Melo, Carlos (advisor), Laguna, Pablo (committee member), Brown, Kenneth (committee member), Fernandez-Nieves, Alberto (committee member), Ghomi, Mohammad (committee member).
Subjects/Keywords: Ultracold atoms; Degenerate Fermi gas; Spin-orbit coupling
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Han, L. (2014). Spin-orbit coupled ultracold fermions. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/52314
Chicago Manual of Style (16th Edition):
Han, Li. “Spin-orbit coupled ultracold fermions.” 2014. Doctoral Dissertation, Georgia Tech. Accessed January 23, 2021.
http://hdl.handle.net/1853/52314.
MLA Handbook (7th Edition):
Han, Li. “Spin-orbit coupled ultracold fermions.” 2014. Web. 23 Jan 2021.
Vancouver:
Han L. Spin-orbit coupled ultracold fermions. [Internet] [Doctoral dissertation]. Georgia Tech; 2014. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/1853/52314.
Council of Science Editors:
Han L. Spin-orbit coupled ultracold fermions. [Doctoral Dissertation]. Georgia Tech; 2014. Available from: http://hdl.handle.net/1853/52314
26.
Radic, Juraj.
Spin-Orbit-Coupled Quantum Gases.
Degree: Physics, 2015, University of Maryland
URL: http://hdl.handle.net/1903/17260
► The dissertation explores the effects of synthetic spin-orbit coupling on the behaviour of quantum gases in several different contexts. We first study realistic methods to…
(more)
▼ The dissertation explores the effects of synthetic
spin-
orbit coupling on the behaviour of quantum gases in several different contexts.
We first study realistic methods to create vortices in
spin-
orbit-coupled (SOC) Bose-Einstein condensates (BEC). We propose two different methods to induce thermodynamically stable static vortex configurations: (1) to rotate both the Raman lasers and the anisotropic trap; and (2) to impose a synthetic Abelian field on top of synthetic
spin-
orbit interactions. We solve the Gross-Pitaevskii equation for several experimentally relevant regimes and find new interesting effects such as spatial separation of left- and right-moving
spin-
orbit-coupled condensates, and the appearance of unusual vortex arrangements.
Next we consider cold atoms in an optical lattice with synthetic SOC in the Mott-insulator regime. We calculate the parameters of the corresponding tight-binding model and derive the low-energy
spin Hamiltonian which is a combination of Heisenberg model, quantum compass model and Dzyaloshinskii-Moriya interaction. We find that the Hamiltonian supports a rich classical phase diagram with collinear, spiral and vortex phases.
Next we study the time evolution of the magnetization in a Rashba
spin-
orbit-coupled Fermi gas, starting from a fully-polarized initial state. We model the dynamics using a Boltzmann equation, which we solve in the Hartree-Fock approximation. The resulting non-linear system of equations gives rise to three distinct dynamical regimes controlled by the ratio of interaction and
spin-
orbit-
coupling strength λ: for small λ, the magnetization decays to zero. For intermediate λ, it displays undamped oscillations about zero and for large λ, a partially magnetized state is dynamically stabilized.
Motivated by an interesting stripe phase which appears in BEC with SOC [Li et al., Phys. Rev. Lett. 108, 225301 (2011)], we study the finite-temperature phase diagram of a pseudospin-1/2 Bose gas with contact interactions. We show that strong inter-
spin interactions can lead to the appearance of magnetically ordered phases at temperatures above the superfluid transition. For the case of inter-
spin attraction, we also discuss the possibility of a bosonic analogue of the Cooper-paired phase, however this state is not energetically favourable. We extend our calculations to a
spin-
orbit-coupled Bose gas to investigate the possibility of stripe ordering in the normal phase. However, within our approximations, we do not find an instability towards stripe formation.
Finally, we consider a two-dimensional Bose gas at zero temperature with an underlying quartic single-particle dispersion in one spatial direction. This Hamiltonian can be realized using the NIST scheme of
spin-
orbit coupling [Y.-J. Lin, K. Jimenez-Garcia, and I. B. Spielman, Nature 471, 83 (2011)], or using the shaken lattice scheme of Parker et al. [C. V. Parker, L.-C. Ha and C. Chin, Nature Physics 9, 769 (2013)]. By numerically comparing energies of various trial wave-functions, we show that, at low densities, the…
Advisors/Committee Members: Galitski, Victor (advisor).
Subjects/Keywords: Physics; Cold atoms; Quantum gases; Spin-orbit coupling
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Radic, J. (2015). Spin-Orbit-Coupled Quantum Gases. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/17260
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Radic, Juraj. “Spin-Orbit-Coupled Quantum Gases.” 2015. Thesis, University of Maryland. Accessed January 23, 2021.
http://hdl.handle.net/1903/17260.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Radic, Juraj. “Spin-Orbit-Coupled Quantum Gases.” 2015. Web. 23 Jan 2021.
Vancouver:
Radic J. Spin-Orbit-Coupled Quantum Gases. [Internet] [Thesis]. University of Maryland; 2015. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/1903/17260.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Radic J. Spin-Orbit-Coupled Quantum Gases. [Thesis]. University of Maryland; 2015. Available from: http://hdl.handle.net/1903/17260
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Virginia Tech
27.
Rudolph, Martin.
Quantum transport in mesoscopic systems of Bi and other strongly spin-orbit coupled materials.
Degree: PhD, Physics, 2013, Virginia Tech
URL: http://hdl.handle.net/10919/20374
► Systems with strong spin-orbit coupling are of particular interest in solid state physics as an avenue for observing and manipulating spin physics using standard electrical…
(more)
▼ Systems with strong
spin-
orbit coupling are of particular interest in solid state physics as an avenue for observing and manipulating
spin physics using standard electrical techniques. This dissertation focuses on the characteristics of elemental bismuth (Bi), which exhibits some of the strongest intrinsic
spin-
orbit coupling of all elements, and InSb, which exhibits some of the strongest intrinsic
spin-
orbit coupling of all compound semiconductors. The experiments performed study the quantum transport signatures of nano- and micron-scale lithographically defined devices as well as
spin-
orbit coupled material/ferromagnet interfaces. All Bi structures are fabricated from Bi thin "films, and hence a detailed analysis of the characteristics of Bi "film growth by thermal evaporation is provided. Morphologically and electrically high quality "films are grown using a two stage deposition procedure. The phase and
spin coherence of Bi geometries constrained in one, two, and three dimensions are systematically studied by analysis of the weak antilocalization transport signature, a quantum interference phenomenon sensitive to
spin-
orbit coupling. The "findings indicate that the phase coherence scales proportionally to the limiting dimension of the structure for sizes less than 500 nm. Specifically, in Bi wires, the phase coherence length is approximately as long as the wire width. Dephasing due to quantum confinement e"ffects limit the phase coherence in small Bi structures, impairing the observation of controlled interference phenomena in nano-scale Bi rings. The
spin coherence length is independent of dimensional constraint by the film thickness, but increases significantly as the lateral dimensions, such as wire width, are constrained. This is a consequence of the quantum transport contribution from the strongly
spin-
orbit coupled Bi(001) surface state. To probe the Bi surface state further, Bi/CoFe junctions are fabricated. The anisotropic magnetoresistance of the CoFe is modifi"ed when carriers tunnel into the CoFe from Bi, possibly due to a
spin dependent tunneling process or an interaction between the
spin polarized density of states in CoFe and the anisotropic
spin-
orbit coupled density of states in Bi. InSb/CoFe junctions are studied as InSb "films are a simpler
spin-
orbit coupled system compared to Bi "films. For temperatures below 3.5 K, a large, symmetric, and abrupt negative magnetoresistance is observed. The low-"field high resistance state has similar temperature and magnetic "field dependences as the superconducting phase, but a superconducting component in the device measurements seems absent. A differential conductance measurement of the InSb/CoFe interface during
spin injection indicates a quasiparticle gap present at the Fermi energy, coinciding with the large magnetoresistance.
Advisors/Committee Members: Heremans, Jean Joseph (committeechair), Priya, Shashank (committee member), Soghomonian, Victoria Garabed (committee member), Link, Jonathan Marion (committee member), Scarola, Vito W. (committee member).
Subjects/Keywords: spin-orbit coupling; quantum coherence; bismuth; InSb; weak antilocalization
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Rudolph, M. (2013). Quantum transport in mesoscopic systems of Bi and other strongly spin-orbit coupled materials. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/20374
Chicago Manual of Style (16th Edition):
Rudolph, Martin. “Quantum transport in mesoscopic systems of Bi and other strongly spin-orbit coupled materials.” 2013. Doctoral Dissertation, Virginia Tech. Accessed January 23, 2021.
http://hdl.handle.net/10919/20374.
MLA Handbook (7th Edition):
Rudolph, Martin. “Quantum transport in mesoscopic systems of Bi and other strongly spin-orbit coupled materials.” 2013. Web. 23 Jan 2021.
Vancouver:
Rudolph M. Quantum transport in mesoscopic systems of Bi and other strongly spin-orbit coupled materials. [Internet] [Doctoral dissertation]. Virginia Tech; 2013. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/10919/20374.
Council of Science Editors:
Rudolph M. Quantum transport in mesoscopic systems of Bi and other strongly spin-orbit coupled materials. [Doctoral Dissertation]. Virginia Tech; 2013. Available from: http://hdl.handle.net/10919/20374

University of New South Wales
28.
Liu, Hong.
Two Dimensional Quantum Transport with Spin-orbit coupling and many-body interactions.
Degree: Physics, 2019, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/65285
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:63968/SOURCE02?view=true
► I theoretically studied the transport properties in 2D materials using quantum kinetic theory, especially in semiconductors and topological insulators. Firstly, I calculated the Coulomb drag…
(more)
▼ I theoretically studied the transport properties in 2D materials using quantum kinetic theory, especially in semiconductors and topological insulators. Firstly, I calculated the Coulomb drag in a magnetic doped 3D topological insulator. Coulomb drag is caused by the transfer of momentum between electrons in different layers due to the interlayer electron-electron scattering. I determined the role played by the anomalous Hall effect in Coulomb drag in doped massive Dirac fermion systems. The transverse response of the active layer is dominated by a topological term arising from the Berry curvature and the topological mechanism does not contribute to Coulomb drag, yet the longitudinal drag force in the passive layer gives rise to a transverse drag current. This anomalous Hall drag current is independent of the active-layer magnetization, a fact that can be verified experimentally. It depends non-monotonically on the passive-layer magnetization, exhibiting a peak that becomes more pronounced at low densities. Then I calculated the Rashba
spin-
orbit coupling correction to Hall coefficient in 2D hole systems up to the second order. In this work, I demonstrated that quantum
spin dynamics induced by the
spin-
orbit interaction are directly observable in the classical charge transport. I determined the Hall coefficient RH in 2D hole systems at a low magnetic field and showed that it has a sizable
spin-
orbit contribution, which depends on the density ñ, is independent of temperature, is a strong function of the top gate electric field, and can reach 30% of the total. This work provides a general method for extracting the
spin-
orbit parameter from magnetotransport data, applicable even at higher temperatures where Shubnikov-de Haas oscillations and weak antilocalization are difficult to observe. Furthermore, using the analytical calculation and the classical Monte-Carlo simulation, I study the phase diagram of an interacting 2D electron gas with Rashba and Dresselhaus
spin-
orbit coupling. I found the out-of-plane
spin-polarization phase is shrinking when Dresselhaus
spin-
orbit interaction is stronger and stronger. By mapping the interacting 2D electron gas with equal Rashba and Dresselhaus
spin-
orbit coupling system onto the 2D electron gas system, we found out-of-plane
spin-polarization phase disappears and only in-plane
spin polarization phase exists when rS>2.01. The possibilities of the experimental finding of the novel phases are also discussed here.
Advisors/Committee Members: Culcer, Dimitrie, Physics, Faculty of Science, UNSW.
Subjects/Keywords: Many-body interactions; Quantum transport; Spin-orbit coupling
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Liu, H. (2019). Two Dimensional Quantum Transport with Spin-orbit coupling and many-body interactions. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/65285 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:63968/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Liu, Hong. “Two Dimensional Quantum Transport with Spin-orbit coupling and many-body interactions.” 2019. Doctoral Dissertation, University of New South Wales. Accessed January 23, 2021.
http://handle.unsw.edu.au/1959.4/65285 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:63968/SOURCE02?view=true.
MLA Handbook (7th Edition):
Liu, Hong. “Two Dimensional Quantum Transport with Spin-orbit coupling and many-body interactions.” 2019. Web. 23 Jan 2021.
Vancouver:
Liu H. Two Dimensional Quantum Transport with Spin-orbit coupling and many-body interactions. [Internet] [Doctoral dissertation]. University of New South Wales; 2019. [cited 2021 Jan 23].
Available from: http://handle.unsw.edu.au/1959.4/65285 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:63968/SOURCE02?view=true.
Council of Science Editors:
Liu H. Two Dimensional Quantum Transport with Spin-orbit coupling and many-body interactions. [Doctoral Dissertation]. University of New South Wales; 2019. Available from: http://handle.unsw.edu.au/1959.4/65285 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:63968/SOURCE02?view=true

University of St. Andrews
29.
Markovic, Igor.
Interplay of spin-orbit coupling and crystal symmetries in the electronic structures of NbGeSb and Ca₃Ru₂O₇
.
Degree: 2020, University of St. Andrews
URL: http://hdl.handle.net/10023/20531
► This thesis presents the study of electronic structure of two materials with strong spin-orbit coupling using angle-resolved photoemission spectroscopy (ARPES) experiments and density-functional theory (DFT)…
(more)
▼ This thesis presents the study of electronic structure of two materials with strong
spin-
orbit coupling using angle-resolved photoemission spectroscopy (ARPES) experiments and density-functional theory (DFT) band calculations. The two materials are NbGeSb and Ca₃Ru₂O₇, which host weak and strong electronic interactions, respectively. While at first glance they seem rather disparate, I will show in both cases how novel phenomena emerge from the interplay of
spin-
orbit coupling and the crystal symmetries.
In NbGeSb, I combine insights from
spin-integrated and
spin-resolved ARPES measurements with DFT slab calculations to reveal how band inversion of two pairs of
spin-
orbit coupled surface states along the edge of the Brillouin zone results in a peculiar crossing structure with two protected and two asymmetrically gapped crossing points. I show how this is caused by the presence of a mirror symmetry line assigning definite mirror parity to orbital and
spin angular momentum of the bands. This leads to a low-energy description of the crossing points equivalent to a two-dimensional Weyl equation, establishing them as 2D analogues of Weyl points.
In Ca₃Ru₂O₇, on the other hand,
spin-
orbit coupling provides a link between the electronic structure, the underlying antiferromagnetic order and the inherent antipolar distortion in the crystal structure. Our results reveal that a known structural and
spin reorientation transition is caused by a
spin-
orbit derived gapping of a large Fermi surface. The hybridisation term couples the magnetic moment direction with the antipolar distortion of the crystal structure, and is only unlocked when the resulting electronic energy gain becomes enough to overcome the cost of
spin reorientations.
These findings together highlight the abundance of possibilities for novel phenomena arising from the interplay of
spin-
orbit coupling and crystal symmetries in quantum materials.
Advisors/Committee Members: King, Phil (advisor), Mackenzie, Andrew (advisor).
Subjects/Keywords: Photoemission spectroscopy;
Electronic structure;
Crystal symmetries;
Spin-orbit coupling
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Markovic, I. (2020). Interplay of spin-orbit coupling and crystal symmetries in the electronic structures of NbGeSb and Ca₃Ru₂O₇
. (Thesis). University of St. Andrews. Retrieved from http://hdl.handle.net/10023/20531
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Markovic, Igor. “Interplay of spin-orbit coupling and crystal symmetries in the electronic structures of NbGeSb and Ca₃Ru₂O₇
.” 2020. Thesis, University of St. Andrews. Accessed January 23, 2021.
http://hdl.handle.net/10023/20531.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Markovic, Igor. “Interplay of spin-orbit coupling and crystal symmetries in the electronic structures of NbGeSb and Ca₃Ru₂O₇
.” 2020. Web. 23 Jan 2021.
Vancouver:
Markovic I. Interplay of spin-orbit coupling and crystal symmetries in the electronic structures of NbGeSb and Ca₃Ru₂O₇
. [Internet] [Thesis]. University of St. Andrews; 2020. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/10023/20531.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Markovic I. Interplay of spin-orbit coupling and crystal symmetries in the electronic structures of NbGeSb and Ca₃Ru₂O₇
. [Thesis]. University of St. Andrews; 2020. Available from: http://hdl.handle.net/10023/20531
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Colorado
30.
Bromley, Sarah Louise.
Many-Body Physics in an Optical Lattice Clock.
Degree: PhD, 2018, University of Colorado
URL: https://scholar.colorado.edu/phys_gradetds/240
► In this work we study the effect of interactions in an optical lattice clock based on fermionic Sr atoms. In current one-dimensional lattice clocks…
(more)
▼ In this work we study the effect of interactions in an optical lattice clock based on fermionic Sr atoms. In current one-dimensional lattice clocks nuclear
spin-polarized atoms are known to have contact interactions of <i>p</i>-wave character and collective in nature. Here we focus on interactions that will influence the design of future optical lattice clocks. We study the case where atoms are no longer confined to a single nuclear
spin state. By using samples of atoms with different distributions among the ten nuclear
spin states of Sr we show that these interactions are SU(<i>N</i>) symmetric up to a 3% uncertainty in our measurements. Through these measurements we are also able to determine all the <i>s</i>-wave and <i>p</i>-wave scattering lengths. We also study the case of nuclear
spin-polarized interacting atoms that are allowed to tunnel between different lattice sites where the electronic
spin and the motion of these atoms become coupled. We observe spectroscopically the precession of the collective magnetization and evolution of
spin locking effects arising from the interplay between <i>p</i>-wave interactions and interactions induced by the
spin-
orbit coupling. The many-body dynamics are captured by a
spin model that describes a broad class of condensed matter systems ranging from superconductors to quantum magnets. By loading a dense sample of atoms into a magneto-optical trap we are able to observe long-range dipole-dipole interactions between our Sr atoms. These interactions will be important for atomic clocks based on a three dimensional lattice, such as the one recently demonstrated in our lab. In these clocks it is possible to remove the contact interactions between the atoms by loading only one atom per lattice site. In this case the dominant interactions will be from the long-range dipole-dipole interactions that will take place between the atoms.
Advisors/Committee Members: Jun Ye, Ana Maria Rey, James Thompson.
Subjects/Keywords: atomic clocks; collective; spin-orbit coupling; strontium; spin-polarized; Atomic, Molecular and Optical Physics; Physics
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Bromley, S. L. (2018). Many-Body Physics in an Optical Lattice Clock. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/phys_gradetds/240
Chicago Manual of Style (16th Edition):
Bromley, Sarah Louise. “Many-Body Physics in an Optical Lattice Clock.” 2018. Doctoral Dissertation, University of Colorado. Accessed January 23, 2021.
https://scholar.colorado.edu/phys_gradetds/240.
MLA Handbook (7th Edition):
Bromley, Sarah Louise. “Many-Body Physics in an Optical Lattice Clock.” 2018. Web. 23 Jan 2021.
Vancouver:
Bromley SL. Many-Body Physics in an Optical Lattice Clock. [Internet] [Doctoral dissertation]. University of Colorado; 2018. [cited 2021 Jan 23].
Available from: https://scholar.colorado.edu/phys_gradetds/240.
Council of Science Editors:
Bromley SL. Many-Body Physics in an Optical Lattice Clock. [Doctoral Dissertation]. University of Colorado; 2018. Available from: https://scholar.colorado.edu/phys_gradetds/240
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