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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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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 December 12, 2019.
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. 12 Dec 2019.
Vancouver:
Walkup D. Doping and strain effects in strongly spin-orbit coupled
systems. [Internet] [Doctoral dissertation]. Boston College; 2016. [cited 2019 Dec 12].
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 Arizona
2.
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 (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 December 12, 2019.
http://hdl.handle.net/10150/626524.
MLA Handbook (7th Edition):
Chen, Kai. “Spin Transport in Magnetic Nano-Structures
.” 2017. Web. 12 Dec 2019.
Vancouver:
Chen K. Spin Transport in Magnetic Nano-Structures
. [Internet] [Doctoral dissertation]. University of Arizona; 2017. [cited 2019 Dec 12].
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
3.
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 (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 December 12, 2019.
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. 12 Dec 2019.
Vancouver:
Calsaverini RSdPdA. Acoplamento spin-órbita inter-subbanda em heteroestruturas semicondutoras. [Internet] [Masters thesis]. University of São Paulo; 2007. [cited 2019 Dec 12].
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/ ;
The Ohio State University
4.
Svoboda, Christopher.
Spin-Orbital Order and Condensation in 4d and 5d Transition
Metal Oxides.
Degree: PhD, Physics, 2017, The Ohio State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1500397435319782
► Strong correlations and strong spin-orbit coupling are important areas of research in condensed matter physics with many open questions. Transition metal oxides provide a natural…
(more)
▼ Strong correlations and strong
spin-
orbit coupling are
important areas of research in condensed matter physics with many
open questions. Transition metal oxides provide a natural way to
combine these strong correlations and strong
spin-
orbit coupling in
electronic systems. Iridium compounds in the
d
5 configuration
(Ir
4+) have received most of the focus in
this area for the last decade, yet there remains much more
unexplored territory with other electron counts. Here we explore
the magnetism in several classes of 4d and 5d Mott insulating
transition metal oxides with d
1,
d
2, and d
4 electron
counts. We first cover double perovskites
A
2BB'O
6 where the B'
ion is in either the d
1 and
d
2 configuration and the other ions are
nonmagnetic. We develop and solve magnetic models with both
spin
and orbital degrees of freedom within mean field theory. The
anisotropic orbital degrees of freedom play a crucial role in
resolving some outstanding puzzles in these compounds including why
ferromagnetism is common in d
1 but not
d
2 and why the d
1
ferromagnets have negative Curie-Weiss temperatures. Then we cover
a broad class of compounds in the d
4
configuration. Despite the fact that Hund's rules dictate the
ground state should be nonmagnetic, we find that superexchange may
induce magnetic moments and magnetic ordering through the
condensation of triplon excitations. We find condensation occurs
only at k = ¿ which generates antiferromagnetic order in the models
we consider, and strong Hund's
coupling does not induce
ferromagnetism in the large
spin-
orbit coupling limit even though
it induces ferromagnetic interactions in the absence of
spin-
orbit
coupling. We then apply our results to the
d
4 double perovskite
Ba
2YIrO
6. Although
experimental observations indicate the material possesses magnetic
moments, we show that these magnetic moments are likely not due to
condensation induced by superexchange.
Advisors/Committee Members: Trivedi, Nandini (Advisor).
Subjects/Keywords: Physics; magnetism; Mott insulators; spin-orbit coupling
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Manager
APA (6th Edition):
Svoboda, C. (2017). Spin-Orbital Order and Condensation in 4d and 5d Transition
Metal Oxides. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1500397435319782
Chicago Manual of Style (16th Edition):
Svoboda, Christopher. “Spin-Orbital Order and Condensation in 4d and 5d Transition
Metal Oxides.” 2017. Doctoral Dissertation, The Ohio State University. Accessed December 12, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1500397435319782.
MLA Handbook (7th Edition):
Svoboda, Christopher. “Spin-Orbital Order and Condensation in 4d and 5d Transition
Metal Oxides.” 2017. Web. 12 Dec 2019.
Vancouver:
Svoboda C. Spin-Orbital Order and Condensation in 4d and 5d Transition
Metal Oxides. [Internet] [Doctoral dissertation]. The Ohio State University; 2017. [cited 2019 Dec 12].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1500397435319782.
Council of Science Editors:
Svoboda C. Spin-Orbital Order and Condensation in 4d and 5d Transition
Metal Oxides. [Doctoral Dissertation]. The Ohio State University; 2017. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1500397435319782
University of Delaware
5.
Wang, Tao.
Spin orbit coupling induced phenomena in spintronic devices
.
Degree: 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.
Subjects/Keywords: Pure sciences;
Coupling;
Orbit;
Spin;
Spintronic
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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 December 12, 2019.
http://udspace.udel.edu/handle/19716/23538.
MLA Handbook (7th Edition):
Wang, Tao. “Spin orbit coupling induced phenomena in spintronic devices
.” 2017. Web. 12 Dec 2019.
Vancouver:
Wang T. Spin orbit coupling induced phenomena in spintronic devices
. [Internet] [Doctoral dissertation]. University of Delaware; 2017. [cited 2019 Dec 12].
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
Princeton University
6.
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 ·
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MLA ·
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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 December 12, 2019.
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. 12 Dec 2019.
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 2019 Dec 12].
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 Cambridge
7.
Fang, Zhou.
Current-induced torques in ferromagnets at room temperature.
Degree: PhD, 2017, University of Cambridge
URL: https://www.repository.cam.ac.uk/handle/1810/268099
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.767718
► This thesis uses ferromagnetic resonance to explore the current-induced torques (CITs) in two different systems, namely YIG/heavy metal bilayers and bulk NiMnSb, at room temperature.…
(more)
▼ This thesis uses ferromagnetic resonance to explore the current-induced torques (CITs) in two different systems, namely YIG/heavy metal bilayers and bulk NiMnSb, at room temperature. We apply a microwave current to the sample while sweeping the external magnetic field, and measure the longitudinal DC voltage. From a symmetry analysis of the ferromagnetic resonance lineshape, the amplitudes and directions of the CITs parameterised by an effective magnetic field are accurately estimated. In Chapter 4, YIG samples of different thickness, capped by either Pt or Ta, are studied. The resonance is driven by both spin-transfer torque and Oersted field, and the DC voltage is attributed to both spin rectification and spin pumping. The CITs can be well analysed from the lineshape of the voltage and its dependence on YIG thickness, from which we deduce that the Oersted field dominates over the spin-transfer torque in driving magnetization dynamics. In Chapter 5, we characterise the CITs in bulk NiMnSb induced by the relativistic spin-orbit coupling effect. Both field-like and antidamping-like spin-orbit torques are observed and analysed in detail. At the end of this chapter, we study the spin-wave resonance driven by the CITs, from which the exchange stiffness of NiMnSb is determined. In Chapter 6, we extrapolate a new form of magnetoresistance in NiMnSb: unidirectional spin-orbit magnetoresistance (USOMR). USOMR scales linearly with the current and has opposite sign when the magnetization is reversed. Similar to the giant magnetoresistance in magnetic multilayers, USOMR can be used to distinguish between two opposite magnetization directions directly in the bulk of the ferromagnet.
Subjects/Keywords: Spintronics; current-induced torque; ferromagnets; spin-orbit coupling; spin-orbit magnetoresistance; NiMnSb; YIG
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APA ·
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MLA ·
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Manager
APA (6th Edition):
Fang, Z. (2017). Current-induced torques in ferromagnets at room temperature. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/268099 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.767718
Chicago Manual of Style (16th Edition):
Fang, Zhou. “Current-induced torques in ferromagnets at room temperature.” 2017. Doctoral Dissertation, University of Cambridge. Accessed December 12, 2019.
https://www.repository.cam.ac.uk/handle/1810/268099 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.767718.
MLA Handbook (7th Edition):
Fang, Zhou. “Current-induced torques in ferromagnets at room temperature.” 2017. Web. 12 Dec 2019.
Vancouver:
Fang Z. Current-induced torques in ferromagnets at room temperature. [Internet] [Doctoral dissertation]. University of Cambridge; 2017. [cited 2019 Dec 12].
Available from: https://www.repository.cam.ac.uk/handle/1810/268099 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.767718.
Council of Science Editors:
Fang Z. Current-induced torques in ferromagnets at room temperature. [Doctoral Dissertation]. University of Cambridge; 2017. Available from: https://www.repository.cam.ac.uk/handle/1810/268099 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.767718
University of Cambridge
8.
Fang, Zhou.
Current-induced torques in ferromagnets at room temperature
.
Degree: 2017, University of Cambridge
URL: https://www.repository.cam.ac.uk/handle/1810/268099
► This thesis uses ferromagnetic resonance to explore the current-induced torques (CITs) in two different systems, namely YIG/heavy metal bilayers and bulk NiMnSb, at room temperature.…
(more)
▼ This thesis uses ferromagnetic resonance to explore the current-induced torques (CITs) in two different systems, namely YIG/heavy metal bilayers and bulk NiMnSb, at room temperature. We apply a microwave current to the sample while sweeping the external magnetic field, and measure the longitudinal DC voltage. From a symmetry analysis of the ferromagnetic resonance lineshape, the amplitudes and directions of the CITs parameterised by an effective magnetic field are accurately estimated.
In Chapter 4, YIG samples of different thickness, capped by either Pt or Ta, are studied. The resonance is driven by both spin-transfer torque and Oersted field, and the DC voltage is attributed to both spin rectification and spin pumping. The CITs can be well analysed from the lineshape of the voltage and its dependence on YIG thickness, from which we deduce that the Oersted field dominates over the spin-transfer torque in driving magnetization dynamics.
In Chapter 5, we characterise the CITs in bulk NiMnSb induced by the relativistic spin-orbit coupling effect. Both field-like and antidamping-like spin-orbit torques are observed and analysed in detail. At the end of this chapter, we study the spin-wave resonance driven by the CITs, from which the exchange stiffness of NiMnSb is determined.
In Chapter 6, we extrapolate a new form of magnetoresistance in NiMnSb: unidirectional spin-orbit magnetoresistance (USOMR). USOMR scales linearly with the current and has opposite sign when the magnetization is reversed. Similar to the giant magnetoresistance in magnetic multilayers, USOMR can be used to distinguish between two opposite magnetization directions directly in the bulk of the ferromagnet.
Subjects/Keywords: Spintronics;
current-induced torque;
ferromagnets;
spin-orbit coupling;
spin-orbit magnetoresistance;
NiMnSb;
YIG
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APA (6th Edition):
Fang, Z. (2017). Current-induced torques in ferromagnets at room temperature
. (Thesis). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/268099
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):
Fang, Zhou. “Current-induced torques in ferromagnets at room temperature
.” 2017. Thesis, University of Cambridge. Accessed December 12, 2019.
https://www.repository.cam.ac.uk/handle/1810/268099.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Fang, Zhou. “Current-induced torques in ferromagnets at room temperature
.” 2017. Web. 12 Dec 2019.
Vancouver:
Fang Z. Current-induced torques in ferromagnets at room temperature
. [Internet] [Thesis]. University of Cambridge; 2017. [cited 2019 Dec 12].
Available from: https://www.repository.cam.ac.uk/handle/1810/268099.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Fang Z. Current-induced torques in ferromagnets at room temperature
. [Thesis]. University of Cambridge; 2017. Available from: https://www.repository.cam.ac.uk/handle/1810/268099
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Delaware
9.
Kandaz, Fatih.
Anisotropic spin relaxation in mesoscopic nonmagnetic channels
.
Degree: 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.
Subjects/Keywords: Pure sciences;
Applied sciences;
Magnetism;
Spin current;
Spin polarization;
Spin relaxation;
Spin-orbit coupling;
Spintronics
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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 December 12, 2019.
http://udspace.udel.edu/handle/19716/23597.
MLA Handbook (7th Edition):
Kandaz, Fatih. “Anisotropic spin relaxation in mesoscopic nonmagnetic channels
.” 2018. Web. 12 Dec 2019.
Vancouver:
Kandaz F. Anisotropic spin relaxation in mesoscopic nonmagnetic channels
. [Internet] [Doctoral dissertation]. University of Delaware; 2018. [cited 2019 Dec 12].
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
University of Cincinnati
10.
RAHMAN, S.M. SAYDUR.
Spontaneous Spin Polarization due to Lateral Spin Orbit
Coupling in InAs Quantum Point Contacts.
Degree: PhD, Arts and Sciences : Physics, 2007, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1196103387
► This dissertation reports the first experimental observation of spontaneous spin polarization due to lateral spin orbit coupling (LSOC) in side- gated (SG) quantum point contacts…
(more)
▼ This dissertation reports the first experimental
observation of spontaneous
spin polarization due to lateral
spin
orbit coupling (LSOC) in side- gated (SG) quantum point contacts
(QPCs). The QPC devices are fabricated on InAs/InGaAs quantum well
structures using e-beam lithography. The low band gap InAs
semiconductor was chosen because of its large intrinsic
spin-
orbit
coupling. The side gates are realized by wet etching technique
which is optimized to pattern the QPC devices. The width of the QPC
is varied from 200 nm to 500 nm, while the length of the QPC is
kept in the range 150-200 nm. The gradient in the lateral potential
confinement in a side gated (SG) quantum point contact (QPC) causes
a
spin-
orbit coupling (SOC). This LSOC induces a spontaneous
spin
polarization of opposite nature at the two edges of the QPC in the
absence of any applied magnetic field. We have observed an
anomalous conductance plateau at G @ 0.5 (2e2/h) (0.5 structure) in
the SG QPCs fabricated on InAs/InGaAs QW structures. The 0.5
structure moves up in perpendicular magnetic field and approaches
the normal conduction quantization at G = (2e2/h) in high magnetic
field, whereas in-plane magnetic field has no effect on it. The
evolution in magnetic field clearly indicates LSOC is responsible
for the 0.5 structure. We believe it is the asymmetry in the
confining potential of the QPC that leads to a net
spin
polarization giving the 0.5 structure. By electrically modulating
the asymmetry of the QPC confinement, we have succeeded in making
this structure appear and disappear. Such a QPC can conceivably be
used as a
spin polarizer or detector on demand by tuning the gate
voltages. We also have proposed a dual-QPC device to experimentally
validate the
spin polarization by electrical means.
Advisors/Committee Members: Debray, Philippe (Advisor).
Subjects/Keywords: Physics, Condensed Matter; Spin Polarization; Spin Orbit Coupling; Quantum Point Contact
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APA (6th Edition):
RAHMAN, S. M. S. (2007). Spontaneous Spin Polarization due to Lateral Spin Orbit
Coupling in InAs Quantum Point Contacts. (Doctoral Dissertation). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1196103387
Chicago Manual of Style (16th Edition):
RAHMAN, S M SAYDUR. “Spontaneous Spin Polarization due to Lateral Spin Orbit
Coupling in InAs Quantum Point Contacts.” 2007. Doctoral Dissertation, University of Cincinnati. Accessed December 12, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1196103387.
MLA Handbook (7th Edition):
RAHMAN, S M SAYDUR. “Spontaneous Spin Polarization due to Lateral Spin Orbit
Coupling in InAs Quantum Point Contacts.” 2007. Web. 12 Dec 2019.
Vancouver:
RAHMAN SMS. Spontaneous Spin Polarization due to Lateral Spin Orbit
Coupling in InAs Quantum Point Contacts. [Internet] [Doctoral dissertation]. University of Cincinnati; 2007. [cited 2019 Dec 12].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1196103387.
Council of Science Editors:
RAHMAN SMS. Spontaneous Spin Polarization due to Lateral Spin Orbit
Coupling in InAs Quantum Point Contacts. [Doctoral Dissertation]. University of Cincinnati; 2007. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1196103387
11.
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 (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 December 12, 2019.
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. 12 Dec 2019.
Vancouver:
DEORANI P. TANTALUM AND BISMUTH SELENIDE BASED SPIN PUMPING DEVICES. [Internet] [Thesis]. National University of Singapore; 2015. [cited 2019 Dec 12].
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
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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MLA ·
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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 December 12, 2019.
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. 12 Dec 2019.
Vancouver:
Hong S. SPIN CIRCUIT REPRESENTATION OF ELECTRONIC TRANSPORT IN MATERIALS WITH SPIN ORBIT COUPLING. [Internet] [Doctoral dissertation]. Purdue University; 2014. [cited 2019 Dec 12].
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 (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 December 12, 2019.
http://hdl.handle.net/1911/76345.
MLA Handbook (7th Edition):
Balasubramanian, Ramachandhran. “Rashba Spin-Orbit Coupled Quantum Gases.” 2014. Web. 12 Dec 2019.
Vancouver:
Balasubramanian R. Rashba Spin-Orbit Coupled Quantum Gases. [Internet] [Doctoral dissertation]. Rice University; 2014. [cited 2019 Dec 12].
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 (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 December 12, 2019.
http://hdl.handle.net/11299/202437.
MLA Handbook (7th Edition):
Liang, Zhaoxin. “Design, Simulation, and Optimization of Spintronic Logic Devices.” 2019. Web. 12 Dec 2019.
Vancouver:
Liang Z. Design, Simulation, and Optimization of Spintronic Logic Devices. [Internet] [Doctoral dissertation]. University of Minnesota; 2019. [cited 2019 Dec 12].
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
Texas A&M University
15.
Liu, Xin.
Spin Dynamics in the Presence of Spin-orbit Interactions: from the Weak to the Strong Spin-orbit Coupling Regime.
Degree: 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 (6th Edition):
Liu, X. (2012). Spin Dynamics in the Presence of Spin-orbit Interactions: from the Weak to the Strong Spin-orbit Coupling Regime. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11703
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):
Liu, Xin. “Spin Dynamics in the Presence of Spin-orbit Interactions: from the Weak to the Strong Spin-orbit Coupling Regime.” 2012. Thesis, Texas A&M University. Accessed December 12, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11703.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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. 12 Dec 2019.
Vancouver:
Liu X. Spin Dynamics in the Presence of Spin-orbit Interactions: from the Weak to the Strong Spin-orbit Coupling Regime. [Internet] [Thesis]. Texas A&M University; 2012. [cited 2019 Dec 12].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11703.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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. [Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11703
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
16.
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 (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 December 12, 2019.
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. 12 Dec 2019.
Vancouver:
Lin T. Orbital Hall effect in k-linear spin-orbit coupled semiconductor systems. [Internet] [Thesis]. NSYSU; 2014. [cited 2019 Dec 12].
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
17.
Miraglia Franco de Carvalho, Felipe.
Nonadiabatic Dynamics with Spin-orbit couplings.
Degree: 2017, EPFL
URL: http://infoscience.epfl.ch/record/225959
► This thesis deals with the excited-states dynamics of molecules beyond the Bon-Oppenheimer approximation (nonadiabatic dynamics). The nuclei were always treated with classical mechanics while the…
(more)
▼ This thesis deals with the excited-states dynamics of molecules beyond the Bon-Oppenheimer approximation (nonadiabatic dynamics). The nuclei were always treated with classical mechanics while the electrons were treated quantum mechanically, using linear-response time-dependent density functional theory for the calculation of electronic excited states. The focus of the work is the treatment of intersystem crossing through the use of auxiliary wavefunctions to calculate
spin-
orbit coupling. \ The text includes a review of the necessary theoretical concepts, an description of the method used to calculate
spin-
orbit coupling and applications to static calculations and dynamics simulations of small molecules and large carbon nanostructures.
Advisors/Committee Members: Tildesley, Dominic John, Tavernelli, Ivano.
Subjects/Keywords: TDDFT; nonadiabatic dynamics; intersystem crossing; spin-orbit coupling
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APA (6th Edition):
Miraglia Franco de Carvalho, F. (2017). Nonadiabatic Dynamics with Spin-orbit couplings. (Thesis). EPFL. Retrieved from http://infoscience.epfl.ch/record/225959
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):
Miraglia Franco de Carvalho, Felipe. “Nonadiabatic Dynamics with Spin-orbit couplings.” 2017. Thesis, EPFL. Accessed December 12, 2019.
http://infoscience.epfl.ch/record/225959.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Miraglia Franco de Carvalho, Felipe. “Nonadiabatic Dynamics with Spin-orbit couplings.” 2017. Web. 12 Dec 2019.
Vancouver:
Miraglia Franco de Carvalho F. Nonadiabatic Dynamics with Spin-orbit couplings. [Internet] [Thesis]. EPFL; 2017. [cited 2019 Dec 12].
Available from: http://infoscience.epfl.ch/record/225959.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Miraglia Franco de Carvalho F. Nonadiabatic Dynamics with Spin-orbit couplings. [Thesis]. EPFL; 2017. Available from: http://infoscience.epfl.ch/record/225959
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Georgia Tech
18.
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 (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 December 12, 2019.
http://hdl.handle.net/1853/52314.
MLA Handbook (7th Edition):
Han, Li. “Spin-orbit coupled ultracold fermions.” 2014. Web. 12 Dec 2019.
Vancouver:
Han L. Spin-orbit coupled ultracold fermions. [Internet] [Doctoral dissertation]. Georgia Tech; 2014. [cited 2019 Dec 12].
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
University of California – Riverside
19.
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 December 12, 2019.
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. 12 Dec 2019.
Vancouver:
Lin Z. Charge and Spin Transport in Graphene Heterostructures and Cr2Ge2Te6. [Internet] [Thesis]. University of California – Riverside; 2017. [cited 2019 Dec 12].
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
20.
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 (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 December 12, 2019.
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. 12 Dec 2019.
Vancouver:
Trinh J. Low temperature properties of strong spin-orbit systems. [Internet] [Thesis]. University of California – Santa Cruz; 2016. [cited 2019 Dec 12].
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
University of California – Berkeley
21.
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 (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 December 12, 2019.
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. 12 Dec 2019.
Vancouver:
Yi D. Engineering the Magnetoelectric Coupling in Complex Oxides Heterostructures. [Internet] [Thesis]. University of California – Berkeley; 2015. [cited 2019 Dec 12].
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
Virginia Tech
22.
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 ·
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MLA ·
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Export
to Zotero / EndNote / Reference
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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 December 12, 2019.
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. 12 Dec 2019.
Vancouver:
Rudolph M. Quantum transport in mesoscopic systems of Bi and other strongly spin-orbit coupled materials. [Internet] [Doctoral dissertation]. Virginia Tech; 2013. [cited 2019 Dec 12].
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
23.
Johansson, Petter.
Contribution from Spin-Orbit Coupling to the Langmuir Wave Dispersion Relation in Magnetized Plasmas.
Degree: Physics, 2010, Umeå University
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-46820
► This thesis analyses the effect spin-orbit coupling has on the dispersion of Langmuir waves in magnetized plasmas, using recently developed kinetic theories of plasmas…
(more)
▼ This thesis analyses the effect
spin-
orbit coupling has on the dispersion of Langmuir waves in magnetized plasmas, using recently developed kinetic theories of plasmas including quantummechanical and relativistic effects. Two new wave modes appearclose to the resonance <img src="http://www.diva-portal.org/cgi-bin/mimetex.cgi?%5CDelta%20%5Comega_%7Bc%7D" /> = ( g/2 − 1)<img src="http://www.diva-portal.org/cgi-bin/mimetex.cgi?%5Comega_%7Bc%7D" /> , where <img src="http://www.diva-portal.org/cgi-bin/mimetex.cgi?%5Comega_%7Bc%7D" /> is the cyclotron frequency and
g is the electron gyromagnetic ratio. Forconsidered long wave lengths the deviation from this resonanceis very small. The wave modes are also very weakly damped.
Subjects/Keywords: Quantum Plasmas; Langmuir Waves; Spin-Orbit Coupling; Magnetized Plasmas
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APA (6th Edition):
Johansson, P. (2010). Contribution from Spin-Orbit Coupling to the Langmuir Wave Dispersion Relation in Magnetized Plasmas. (Thesis). Umeå University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-46820
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):
Johansson, Petter. “Contribution from Spin-Orbit Coupling to the Langmuir Wave Dispersion Relation in Magnetized Plasmas.” 2010. Thesis, Umeå University. Accessed December 12, 2019.
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-46820.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Johansson, Petter. “Contribution from Spin-Orbit Coupling to the Langmuir Wave Dispersion Relation in Magnetized Plasmas.” 2010. Web. 12 Dec 2019.
Vancouver:
Johansson P. Contribution from Spin-Orbit Coupling to the Langmuir Wave Dispersion Relation in Magnetized Plasmas. [Internet] [Thesis]. Umeå University; 2010. [cited 2019 Dec 12].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-46820.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Johansson P. Contribution from Spin-Orbit Coupling to the Langmuir Wave Dispersion Relation in Magnetized Plasmas. [Thesis]. Umeå University; 2010. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-46820
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Boston College
24.
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 (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 December 12, 2019.
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. 12 Dec 2019.
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 2019 Dec 12].
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
University of Colorado
25.
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 ·
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MLA ·
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Export
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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 December 12, 2019.
https://scholar.colorado.edu/phys_gradetds/240.
MLA Handbook (7th Edition):
Bromley, Sarah Louise. “Many-Body Physics in an Optical Lattice Clock.” 2018. Web. 12 Dec 2019.
Vancouver:
Bromley SL. Many-Body Physics in an Optical Lattice Clock. [Internet] [Doctoral dissertation]. University of Colorado; 2018. [cited 2019 Dec 12].
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
University of Arizona
26.
Zhang, Shulei.
Spin Transport and Magnetization Dynamics in Various Magnetic Systems
.
Degree: 2014, University of Arizona
URL: http://hdl.handle.net/10150/333352
► The general theme of the thesis is the interplay between magnetization dynamics and spin transport. The main presentation is divided into three parts. The first…
(more)
▼ The general theme of the thesis is the interplay between magnetization dynamics and
spin transport. The main presentation is divided into three parts. The first part is devoted to deepening our understanding on magnetic damping of ferromagnetic metals, which is one of the long-standing issues in conventional spintronics that has not been completely understood. For a nonuniformly-magnetized ferromagnetic metal, we find that the damping is nonlocal and is enhanced as compared to that in the uniform case. It is therefore necessary to generalize the conventional Landau-Lifshitz-Gilbert equation to include the additional damping. In a different vein, the decay mechanism of the uniform precession mode has been investigated. We point out the important role of
spin-conserving electron-magnon interaction in the relaxation process by quantitatively examining its contribution to the ferromagnetic resonance linewidth. In the second part, a transport theory is developed for magnons which, in addition to conduction electrons, can also carry and propagate
spin angular momentum via the magnon current. We demonstrate that the mutual conversion of magnon current and
spin current may take place at magnetic interfaces. We also predict a novel magnon-mediated electric drag effect in a metal/magnetic-insulator/metal trilayer structure. This study may pave the way to the new area of insulator-based spintronics. In the third part of thesis, particular attention is paid to the influence the
spin orbit coupling on both charge and
spin transport. We theoretically investigate magnetotransport anisotropy and the conversion relations of
spin and charge currents in various magnetic systems, and apply our results to interpret recent experiments.
Advisors/Committee Members: Zhang, Shufeng (advisor), Wang, Weigang (committeemember), LeRoy, Brian (committeemember), Mazumdar, Sumit (committeemember), Stafford, Charles (committeemember).
Subjects/Keywords: magnetization dynamics;
magnon transport;
spin orbit coupling;
spin transport;
Physics;
magnetic damping
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Export
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Manager
APA (6th Edition):
Zhang, S. (2014). Spin Transport and Magnetization Dynamics in Various Magnetic Systems
. (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/333352
Chicago Manual of Style (16th Edition):
Zhang, Shulei. “Spin Transport and Magnetization Dynamics in Various Magnetic Systems
.” 2014. Doctoral Dissertation, University of Arizona. Accessed December 12, 2019.
http://hdl.handle.net/10150/333352.
MLA Handbook (7th Edition):
Zhang, Shulei. “Spin Transport and Magnetization Dynamics in Various Magnetic Systems
.” 2014. Web. 12 Dec 2019.
Vancouver:
Zhang S. Spin Transport and Magnetization Dynamics in Various Magnetic Systems
. [Internet] [Doctoral dissertation]. University of Arizona; 2014. [cited 2019 Dec 12].
Available from: http://hdl.handle.net/10150/333352.
Council of Science Editors:
Zhang S. Spin Transport and Magnetization Dynamics in Various Magnetic Systems
. [Doctoral Dissertation]. University of Arizona; 2014. Available from: http://hdl.handle.net/10150/333352
27.
Chen, Y.T.
Spin Caloritronic Phenomena Driven by Spin-orbit Coupling.
Degree: 2014, Casimir PHD Series
URL: http://resolver.tudelft.nl/uuid:41420308-05e7-4fc4-9836-ab733027bc75
;
urn:NBN:nl:ui:24-uuid:41420308-05e7-4fc4-9836-ab733027bc75
;
urn:NBN:nl:ui:24-uuid:41420308-05e7-4fc4-9836-ab733027bc75
;
http://resolver.tudelft.nl/uuid:41420308-05e7-4fc4-9836-ab733027bc75
► In this thesis, we report several effects in spintronics and spin caloritronics related to relativistic spin-orbit coupling. In Chapter 2, we discuss the relativistic spin…
(more)
▼ In this thesis, we report several effects in spintronics and
spin caloritronics related to relativistic
spin-
orbit coupling. In Chapter 2, we discuss the relativistic
spin caloritronicHall effects in terms of a semiclassical theory for anomalous thermoelectric effects in ferromagnetic metals due to
spin-
orbit scattering at impurities, including the anomalous Nernst and Ettingshausen effect, the planar thermalHall effects, and thermolectric anisotropic magnetoresistance. The linear response relations between the currents and driving forces are derived for out-of-plane and in-plane magnetizations, respectively. In the out-of-plane configuration, there are anomalous thermoelectric Hall effects linear to the
spin-
orbit constant, while the thermoelectric anisotropic magnetoresistance and the planar Hall effect in the in-plane configuration are of second order in the
spin-
orbit coupling. The extrinsic theory systemizes the competing effects/mechanisms from a microscopic point of view and identifies the parameters needed to describe experiments. We developed a diffusion theory in Chapter 3 for the
spin Hall magnetoresistance (SMR) in multilayers made from an insulating magnet F such as yttriumiron garnet (YIG), and a normal metal N with
spin-
orbit interactions, such as platinum (Pt). In an N|F bilayer system, the SMR requires
spin-flip in N and
spin-transfer at the N|F interface. Our results explain the SMR both qualitatively and quantitatively with transport parameters that are consistent with other experiments. The degrees of
spin accumulation in N that can be controlled by the magnetization direction is found to be very significant. In the presence of an imaginary part of the
spin-mixing conductance Gi we predicted an AHE-like signal (SHAHE), which has been observed experimentally and can be explained with values of Gi that agree with first principles calculations. We furthermore analyzed F|N|F
spin valves for parallel and perpendicular magnetization configurations. The SMR torques under applied currents in N are expected to lead to magnetization dynamics of N|F and F|N|F structures. In Chapter 4,we generalized the SMR theory in Chapter 3 to a thin-film made of a metallic ferromagnet and take into account the out-of-plane
spin currents generated by the spinHall effect, which were disregarded in Chapter 2. We predict a new contribution to the anisotropic magnetoresistance by the simultaneous action of the anomalous Hall effect and its inverse. By diffusion theory, we compare this contribution with the conventional anisotropic magnetoresistance, demonstrating that they can be distinguished experimentally by studying its dependence on the film thickness. The extra contribution to the magnetoresistance has a magnetization dependence different from that of the conventional AMR. While the conventional AMR is usually positive, the new contribution is always negative. In order to analyze the effect of interface and boundary roughness that was disregarded in Chapter 3, we reports in Chapter 5 a Boltzmann study to quantify how the…
Advisors/Committee Members: Bauer, G.E.W..
Subjects/Keywords: spintronics; spin caloritronics; spin-orbit coupling
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APA ·
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MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Chen, Y. T. (2014). Spin Caloritronic Phenomena Driven by Spin-orbit Coupling. (Doctoral Dissertation). Casimir PHD Series. Retrieved from http://resolver.tudelft.nl/uuid:41420308-05e7-4fc4-9836-ab733027bc75 ; urn:NBN:nl:ui:24-uuid:41420308-05e7-4fc4-9836-ab733027bc75 ; urn:NBN:nl:ui:24-uuid:41420308-05e7-4fc4-9836-ab733027bc75 ; http://resolver.tudelft.nl/uuid:41420308-05e7-4fc4-9836-ab733027bc75
Chicago Manual of Style (16th Edition):
Chen, Y T. “Spin Caloritronic Phenomena Driven by Spin-orbit Coupling.” 2014. Doctoral Dissertation, Casimir PHD Series. Accessed December 12, 2019.
http://resolver.tudelft.nl/uuid:41420308-05e7-4fc4-9836-ab733027bc75 ; urn:NBN:nl:ui:24-uuid:41420308-05e7-4fc4-9836-ab733027bc75 ; urn:NBN:nl:ui:24-uuid:41420308-05e7-4fc4-9836-ab733027bc75 ; http://resolver.tudelft.nl/uuid:41420308-05e7-4fc4-9836-ab733027bc75.
MLA Handbook (7th Edition):
Chen, Y T. “Spin Caloritronic Phenomena Driven by Spin-orbit Coupling.” 2014. Web. 12 Dec 2019.
Vancouver:
Chen YT. Spin Caloritronic Phenomena Driven by Spin-orbit Coupling. [Internet] [Doctoral dissertation]. Casimir PHD Series; 2014. [cited 2019 Dec 12].
Available from: http://resolver.tudelft.nl/uuid:41420308-05e7-4fc4-9836-ab733027bc75 ; urn:NBN:nl:ui:24-uuid:41420308-05e7-4fc4-9836-ab733027bc75 ; urn:NBN:nl:ui:24-uuid:41420308-05e7-4fc4-9836-ab733027bc75 ; http://resolver.tudelft.nl/uuid:41420308-05e7-4fc4-9836-ab733027bc75.
Council of Science Editors:
Chen YT. Spin Caloritronic Phenomena Driven by Spin-orbit Coupling. [Doctoral Dissertation]. Casimir PHD Series; 2014. Available from: http://resolver.tudelft.nl/uuid:41420308-05e7-4fc4-9836-ab733027bc75 ; urn:NBN:nl:ui:24-uuid:41420308-05e7-4fc4-9836-ab733027bc75 ; urn:NBN:nl:ui:24-uuid:41420308-05e7-4fc4-9836-ab733027bc75 ; http://resolver.tudelft.nl/uuid:41420308-05e7-4fc4-9836-ab733027bc75
University of Colorado
28.
Huang, Yi-Ping.
Symmetries and Topological Order: Realizations and Signals in Correlated Strong Spin-Orbit Coupled Materials.
Degree: PhD, 2017, University of Colorado
URL: http://scholar.colorado.edu/phys_gradetds/202
► Spin-orbit coupling exists in materials in general. However, it entangles the spin and orbital degrees of freedom and complicates the model. Thus, theorists usually…
(more)
▼ Spin-
orbit coupling exists in materials in general. However, it entangles the
spin and orbital degrees of freedom and complicates the model. Thus, theorists usually neglect the effects induced by
spin-
orbit coupling first and consider
spin-
orbit coupling as perturbation next. The non-perturbative effects brought up by
spin-
orbit coupling are thus often less studied or overlooked.
On the other hand, the majority in the study of interacting topological order focusing on the general structure of theories and made significant advances by leaving material details behind. It is thus important to find possible microscopic models that could realize the new phases in laboratories and benefits from the progress of theories to make experimental predictions.
In this thesis, we study the physical effects due to strong
spin-
orbit coupling from the perspective of searching new quantum orders and the non-trivial responses.
(i) The first project, we propose the nontrivial dipolar-octupolar (DO) doublets on the pyrochlore lattice. By studying the most general symmetry allowed model at the localized and the itinerant limit for DO doublets, we found two 3D symmetry enriched topological orders and topological insulator correspondingly. (ii) In the second project, we analyze the 2D model descending from the localized limit of DO doublets on pyrochlore. The discrete onsite symmetry and space group symmetry could lead to a symmetry-enriched topological order with symmetry fractionalization pattern that cannot emerge from a
spin model with continuous
spin rotational symmetry. The non-trivial symmetry fractionalization pattern contributes to the striking numerical signal that can help identifying the topological order. (iii) In the third project, we develop a theory to understand the high-energy Raman signal in Sr
2IrO
4.
Advisors/Committee Members: Michael Hermele, Victor Gurarie, Ana Maria Rey, Dmitry Reznik, Joel Eaves.
Subjects/Keywords: correlated electrons; quantum spin ice; quantum spin liquid; spin-orbit coupling; topological order; Condensed Matter Physics; Other Physics; Quantum Physics
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Huang, Y. (2017). Symmetries and Topological Order: Realizations and Signals in Correlated Strong Spin-Orbit Coupled Materials. (Doctoral Dissertation). University of Colorado. Retrieved from http://scholar.colorado.edu/phys_gradetds/202
Chicago Manual of Style (16th Edition):
Huang, Yi-Ping. “Symmetries and Topological Order: Realizations and Signals in Correlated Strong Spin-Orbit Coupled Materials.” 2017. Doctoral Dissertation, University of Colorado. Accessed December 12, 2019.
http://scholar.colorado.edu/phys_gradetds/202.
MLA Handbook (7th Edition):
Huang, Yi-Ping. “Symmetries and Topological Order: Realizations and Signals in Correlated Strong Spin-Orbit Coupled Materials.” 2017. Web. 12 Dec 2019.
Vancouver:
Huang Y. Symmetries and Topological Order: Realizations and Signals in Correlated Strong Spin-Orbit Coupled Materials. [Internet] [Doctoral dissertation]. University of Colorado; 2017. [cited 2019 Dec 12].
Available from: http://scholar.colorado.edu/phys_gradetds/202.
Council of Science Editors:
Huang Y. Symmetries and Topological Order: Realizations and Signals in Correlated Strong Spin-Orbit Coupled Materials. [Doctoral Dissertation]. University of Colorado; 2017. Available from: http://scholar.colorado.edu/phys_gradetds/202
Freie Universität Berlin
29.
Lüffe, Matthias.
Semiklassische Behandlung von Transport und Spinrelaxation in Systemen mit
Spin-Bahn-Kopplung.
Degree: 2012, Freie Universität Berlin
URL: http://dx.doi.org/10.17169/refubium-7946
► Die auf die relativistische Dirac-Gleichung zurückgehende Kopplung von Spin- und Translationsfreiheitsgraden spielt nicht nur in der Atomphysik eine große Rolle, sondern sie macht sich auch…
(more)
▼ Die auf die relativistische Dirac-Gleichung zurückgehende Kopplung von
Spin-
und Translationsfreiheitsgraden spielt nicht nur in der Atomphysik eine große
Rolle, sondern sie macht sich auch und besonders im Festkörper auf vielfältige
Weise bemerkbar. So ist die
Spin-Bahn-Kopplung eine wesentliche Grundlage des
noch jungen Forschungsfeldes der Halbleiter-Spinelektronik, welches von der
Idee getragen ist, den Elektronenspin an Stelle der Ladung zur (potenziell
verlustärmeren) Informationsverarbeitung zu nutzen. Auf dem Weg zum
Spintransistor ist jedoch noch einige Vorarbeit zu leisten, die beispielsweise
das detaillierte Verständnis der Spinrelaxation im Halbleiter betrifft. Der
erste Teil der vorliegenden Arbeit kann in diesen Zusammenhang gestellt
werden. Wir haben uns darin mit den Zerfallsprozessen einer besonders
langlebigen Spindichtewelle befasst, welche innerhalb von Halbleiter-
Heterostrukturen mit exakt gleich großer Dresselhaus- und Rashba-
Spin-Bahn-
Kopplung existieren kann. Im Rahmen einer semiklassischen Theorie haben wir
mittels einer
spin-kohärenten Diffusionsgleichung den Einfluss der Coulomb-
Wechselwirkung auf die Lebensdauer dieser Stabilen Spinhelix untersucht. Dabei
hat sich herausgestellt, dass durch das Vorhandensein von störenden
Wechselwirkungen, welche die spezielle Symmetrie des Problems verletzen, auch
Streuprozesse zwischen Elektronen eine Auswirkung auf die Relaxation der
Spinhelix haben können. Die aus unserer Theorie resultierende
temperaturabhängige Lebensdauer reproduziert die experimentell beobachtete
zufriedenstellende, wobei kubische Dresselhaus-
Spin-Bahn-Kopplung als
wichtigstes symmetriebrechendes Element identifiziert werden kann. Die
Coulombwechselwirkung beeinflusst die Vorgänge in der Stabilen Spinhelix auch
über ein Austausch-Molekularfeld. Dieses bewirkt, dass die einzelnen Spins um
den Vektor der sie umgebenden Spindichte präzedieren und sorgt so für eine
nichtlineare Dynamik der Spindichte. Wir haben gezeigt, dass in einem
experimentell zugänglichen Parameterregime einschlägige nichtlineare Effekte
wie eine drastische Lebensdauerverlängerung durch höhere Spindichten und das
Auftreten von höheren Harmonischen zu erwarten sind. Ein faszinierendes
Festkörpersystem, in dem Effekte von (Pseudo-)
Spin-Bahn-Kopplung in besonderem
Maße zu Tage treten, ist einlagiges Graphen, denn durch seine spezielle
Bandstruktur in Form eines Dirac-Kegels besteht der Hamiltonoperator schon in
führender Ordnung (und überhaupt ausschließlich) aus Pseudospin-Bahn-Kopplung.
Im zweiten Teil dieser Arbeit haben wir Korrekturen in der elektrische
Leitfähigkeit von Graphen im Boltzmann-Regime berechnet, die von Pseudospin-
Kohärenzen herrühren. Wir haben festgestellt, dass verschiedene im Allgemeinen
etablierte Formalismen zur Herleitung von kinetischen Gleichungen für dieses
Problem unterschiedliche Ergebnisse liefern. Diese Diskrepanz können wir nicht
auflösen, jedoch stellen wir einen alternativen Ansatz für die
Nichtgleichgewichts-Greenfunktion zu Diskussion, der einige Widersprüche
beheben würde.…
Advisors/Committee Members: [email protected] (contact), m (gender), Prof. Dr. Tamara Nunner (firstReferee), PD Dr. Daniel Sebastiani (furtherReferee).
Subjects/Keywords: spintronics; spin-orbit coupling; Persistent spin helix; spin relaxation; graphene; electon-hole coherence; 500 Naturwissenschaften und Mathematik::530 Physik
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lüffe, M. (2012). Semiklassische Behandlung von Transport und Spinrelaxation in Systemen mit
Spin-Bahn-Kopplung. (Thesis). Freie Universität Berlin. Retrieved from http://dx.doi.org/10.17169/refubium-7946
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):
Lüffe, Matthias. “Semiklassische Behandlung von Transport und Spinrelaxation in Systemen mit
Spin-Bahn-Kopplung.” 2012. Thesis, Freie Universität Berlin. Accessed December 12, 2019.
http://dx.doi.org/10.17169/refubium-7946.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lüffe, Matthias. “Semiklassische Behandlung von Transport und Spinrelaxation in Systemen mit
Spin-Bahn-Kopplung.” 2012. Web. 12 Dec 2019.
Vancouver:
Lüffe M. Semiklassische Behandlung von Transport und Spinrelaxation in Systemen mit
Spin-Bahn-Kopplung. [Internet] [Thesis]. Freie Universität Berlin; 2012. [cited 2019 Dec 12].
Available from: http://dx.doi.org/10.17169/refubium-7946.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lüffe M. Semiklassische Behandlung von Transport und Spinrelaxation in Systemen mit
Spin-Bahn-Kopplung. [Thesis]. Freie Universität Berlin; 2012. Available from: http://dx.doi.org/10.17169/refubium-7946
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
EPFL
30.
Fatuzzo, Claudia Giuseppina.
Spectroscopic Studies of the Electronic Structure in Layered Cuprates and Ruthenates.
Degree: 2017, EPFL
URL: http://infoscience.epfl.ch/record/230438
► In materials where electrons interact strongly, a number of exotic and exciting phenomena arise. The mechanisms at the base of many of these phenomena remain…
(more)
▼ In materials where electrons interact strongly, a number of exotic and exciting phenomena arise. The mechanisms at the base of many of these phenomena remain debated, as strongly correlated electron physics represents one of the biggest challenges for modern condensed matter physics. Transition metal oxides are a class of strongly correlated systems which exhibit a multitude of physical properties, among which unconventional superconductivity, incommensurate charge and
spin ordering, partial anisotropic gapping, strangemetallicity, colossal magnetoresistance, multiferroicity, antiferromagneticMott insulation, etc.. These properties are often observed in close vicinity, when pressure, temperature or chemical composition are varied. As a consequence, it is challenging to disentangle not only their origin, but also their effects on the elementary excitations of the system. In this thesis, high quality single crystals of copper and ruthenium based transition metal oxides (cuprate and ruthenate compounds) were investigated with synchrotron-based spectroscopic techniques. Our angle resolved photoemission spectroscopy (ARPES) studies focused on the normal state of cuprates, at hole content varying from under- to over-doping. First, the low energy single particle excitations in overdoped uprates were verified to fulfill the mathematical conditions for Landau Fermi quasiparticles. In a second study, the evolution of the spectral gap was followed as function of doping and temperature, across the charge order, pseudogap and strangcuprates, ruthenates, strong correlations, RIXS, ARPES, XAS, pseudogap, strange metal,
spin orbit coupling, crystal field.e metal phases of a cuprate compound, La1.6¡xNd0.4SrxCuO4. This systematic study allowed the identification of an optimal doping regime for the investigation of the pseudogap physics in cuprates. The orbital structure of single layer ruthenates was explored combining X-ray absorption and resonant inelastic X-ray spectroscopies (XAS and RIXS). Since spectroscopies at the L absorption edge of 4d materials are challenged by insufficient energy resolution, we performed our studies at the oxygen K edge, in the soft X-ray energy range. By exploiting the strong orbital hybridization between the oxygen 2p and the ruthenium 4d states, we obtained high resolution experimental access to the 4d electron properties. The results were interpreted through a simple model Hamiltonian, with analytic solutions that provide a consistent description of the low energy features observed.
Advisors/Committee Members: Rønnow, Henrik Moodysson, Chang, Johan Juul.
Subjects/Keywords: cuprates; ruthenates; strong correlations; RIXS; ARPES; XAS; pseudogap; strangemetal; spin orbit coupling; crystal field
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Chicago ·
MLA ·
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Manager
APA (6th Edition):
Fatuzzo, C. G. (2017). Spectroscopic Studies of the Electronic Structure in Layered Cuprates and Ruthenates. (Thesis). EPFL. Retrieved from http://infoscience.epfl.ch/record/230438
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):
Fatuzzo, Claudia Giuseppina. “Spectroscopic Studies of the Electronic Structure in Layered Cuprates and Ruthenates.” 2017. Thesis, EPFL. Accessed December 12, 2019.
http://infoscience.epfl.ch/record/230438.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Fatuzzo, Claudia Giuseppina. “Spectroscopic Studies of the Electronic Structure in Layered Cuprates and Ruthenates.” 2017. Web. 12 Dec 2019.
Vancouver:
Fatuzzo CG. Spectroscopic Studies of the Electronic Structure in Layered Cuprates and Ruthenates. [Internet] [Thesis]. EPFL; 2017. [cited 2019 Dec 12].
Available from: http://infoscience.epfl.ch/record/230438.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Fatuzzo CG. Spectroscopic Studies of the Electronic Structure in Layered Cuprates and Ruthenates. [Thesis]. EPFL; 2017. Available from: http://infoscience.epfl.ch/record/230438
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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Open Access Theses and Dissertations
