subject:( dipolar Bose Einstein condensate)

University of California – Merced

1. Moran, Roxanne Kimberly. Dipolar Bose-Einstein Condensate Dynamics in A Chaotic Potential.

Degree: Physics and Chemistry, 2013, University of California – Merced

URL: http://www.escholarship.org/uc/item/9657c786

► Abstract Dipolar Bose-Einstein Condensate Dynamics in A Chaotic Potential by Roxanne Kimberly Moran Master of Science in Physics University of California, Merced 2013 Professor Jay… (more)

Subjects/Keywords: Physics; Atomic physics; BEC; Bose-Einstein Condensate; Dipolar Interaction; Gross-Pitaevskii; Numerical Simulation

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APA (6^th Edition):

Moran, R. K. (2013). Dipolar Bose-Einstein Condensate Dynamics in A Chaotic Potential. (Thesis). University of California – Merced. Retrieved from http://www.escholarship.org/uc/item/9657c786

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Moran, Roxanne Kimberly. “Dipolar Bose-Einstein Condensate Dynamics in A Chaotic Potential.” 2013. Thesis, University of California – Merced. Accessed April 10, 2021. http://www.escholarship.org/uc/item/9657c786.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Moran, Roxanne Kimberly. “Dipolar Bose-Einstein Condensate Dynamics in A Chaotic Potential.” 2013. Web. 10 Apr 2021.

Vancouver:

Moran RK. Dipolar Bose-Einstein Condensate Dynamics in A Chaotic Potential. [Internet] [Thesis]. University of California – Merced; 2013. [cited 2021 Apr 10]. Available from: http://www.escholarship.org/uc/item/9657c786.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Moran RK. Dipolar Bose-Einstein Condensate Dynamics in A Chaotic Potential. [Thesis]. University of California – Merced; 2013. Available from: http://www.escholarship.org/uc/item/9657c786

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

2. Damon, François. Sonder des structures complexes avec des ondes de matière : Probing complexe structures with matter waves.

Degree: Docteur es, Physique de la matière, 2015, Université Toulouse III – Paul Sabatier

URL: http://www.theses.fr/2015TOU30342

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Ce manuscrit présente les travaux que j'ai effectués au Laboratoire de Physique Théorique durant ma thèse. Ils portent sur l'interaction d'ondes de matière avec des… (more)

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Ce manuscrit présente les travaux que j'ai effectués au Laboratoire de Physique Théorique durant ma thèse. Ils portent sur l'interaction d'ondes de matière avec des réseaux optiques modulables en temps et en espace. L'utilisation de ces réseaux a permis de contrôler de manière cohérente les propriétés dynamiques d'un gaz d 'atomes ultra-froids. Cette étude théorique a été réalisée en collaboration avec le groupe Atomes Froids du Laboratoire LCAR. Les variations spatiales de l'enveloppe d u réseau créent, localement, des gaps spatiaux créant une cavité de Bragg pour onde de matière, dont nous avons étudié en détail les propriétés et qui a fait l'objet d'une réalisation expérimentale impliquant la propagation d'un condensat de Bose-Einstein de rubidium 85 dans un guide d'onde. Nous avons également étudié la propagation d'un nuage d 'atomes dans un réseau bichromatique qui permet de réaliser un simulateur quantique du modèle de Harper. Le spectre du hamiltonien de ce système a une dimension fractale pouvant être caractérisée nu mériquement. Nous avons montré, par ailleurs, qu'il est possible d'exploiter les interactions inter-atomiques répulsives d'un condensat de Bose-Einstein afin d'amplifier les corrélations position-vitesse lors de sa pro pagation dans un guide. Notre étude montre qu'une mesure des grandeurs dynamiques locales du nuage atomique permet de sonder expérimentalement les résonances d'un potentiel optique jusqu'à l'échelle du picoKelvin. Enfin, un nuage d'atomes en interaction attractive admet une solution d'équilibre : le soliton. Nous avons démontré, numériquement, que celui-ci peut être utilisé pour sonder des états liés d'un poten tiel de taille finie, en peuplant ces états lors d'une expérience de diffusion comme, par exemple, des états de surface.

This thesis presents the studies that I did at the Laboratoire de Physique Théorique. It concerns the interaction between matter waves and time and space depandant optical lattices. Using such lattices allows one to manipulate coherently the dynamical properties of ultra cold atoms. This theoretical study has been done in collaboration with the Cold Atoms group at the LCAR laboratory. The spatial variations of the lattice envelope locally create spatial gaps which create a Bragg cavity for matter waves. We have st udied in detail their properties and the cavity has been realized experimentally by using a Ru bid ium 85 Bose-Einstein condensate in a wave guide. We have also studied the propagation of an atomic cloud in a bichromatic optical lattice which allows us to make a quantum simulator of the Harper madel. The spectrum of the system Hamiltonian· posseses a fractal dimension which can be numerically characterized. We have also shawn that it is possible to use the repulsive interatomic interaction of a Bose-Einstein condensate in arder to amplify the momentum-position correlation during propagation in a guide. Our st udy shows that a mesure of local dynamical quantities of the atomic cloud enables one to experimentally probe resonances of an…

Advisors/Committee Members: Georgeot, Bertrand (thesis director), Guéry-Odelin, David (thesis director).

Subjects/Keywords: Bose-Einstein condensate; Optical Lattices

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APA (6^th Edition):

Damon, F. (2015). Sonder des structures complexes avec des ondes de matière : Probing complexe structures with matter waves. (Doctoral Dissertation). Université Toulouse III – Paul Sabatier. Retrieved from http://www.theses.fr/2015TOU30342

Chicago Manual of Style (16^th Edition):

Damon, François. “Sonder des structures complexes avec des ondes de matière : Probing complexe structures with matter waves.” 2015. Doctoral Dissertation, Université Toulouse III – Paul Sabatier. Accessed April 10, 2021. http://www.theses.fr/2015TOU30342.

MLA Handbook (7^th Edition):

Damon, François. “Sonder des structures complexes avec des ondes de matière : Probing complexe structures with matter waves.” 2015. Web. 10 Apr 2021.

Vancouver:

Damon F. Sonder des structures complexes avec des ondes de matière : Probing complexe structures with matter waves. [Internet] [Doctoral dissertation]. Université Toulouse III – Paul Sabatier; 2015. [cited 2021 Apr 10]. Available from: http://www.theses.fr/2015TOU30342.

Council of Science Editors:

Damon F. Sonder des structures complexes avec des ondes de matière : Probing complexe structures with matter waves. [Doctoral Dissertation]. Université Toulouse III – Paul Sabatier; 2015. Available from: http://www.theses.fr/2015TOU30342

University of New Mexico

3. Jiang, Zhang. Particle Correlations in Bose-Einstein Condensates.

Degree: Physics & Astronomy, 2014, University of New Mexico

URL: http://hdl.handle.net/1928/24564

► The impact of interparticle correlations on the behavior of Bose-Einstein Condensates (BECs) is discussed using two approaches. In the first approach, the wavefunction of a… (more)

▼ The impact of interparticle correlations on the behavior of Bose-Einstein Condensates (BECs) is discussed using two approaches. In the first approach, the wavefunction of a BEC is encoded in the <var>N</var>-particle sector of an extended "catalytic state''. Going to a time-dependent interaction picture, we can organize the effective Hamiltonian by powers of <var>N</var><sup> -1/2</sup>. Requiring the terms of order <var>N</var>^1/2 to vanish, we get the Gross-Pitaevskii Equation. Going to the next order, <var>N</var>⁰, we obtain the number-conserving Bogoliubov approximation. Our approach allows one to stay in the Schrödinger picture and to apply many techniques from quantum optics. Moreover, it is easier to track different orders in the Hamiltonian and to generalize to the multi-component case. In the second approach, I consider a state of <var>N</var>=<var>l</var>×<var>n</var> bosons that is derived by symmetrizing the <var>n</var>-fold tensor product of an arbitrary <var>l</var>-boson state. Particularly, we are interested in the pure state case for <var>l</var>=2, which we call the Pair-Correlated State (PCS). I show that PCS reproduces the number-conserving Bogoliubov approximation; moreover, it also works in the strong interaction regime where the Bogoliubov approximation fails. For the two-site Bose-Hubbard model, I find numerically that the error (measured by trace distance of the two-particle RDMs) of PCS is less than two percent over the entire parameter space, thus making PCS a bridge between the superfluid and Mott insulating phases. Amazingly, the error of PCS does not increase, in the time-dependent case, as the system evolves for longer times. I derive both time-dependent and -independent equations for the ground state and the time evolution of the PCS ansatz. The time complexity of simulating PCS does not depend on <var>N</var> and is linear in the number of orbitals in use. Compared to other methods, e.g, the Jastrow wavefunction, the Gutzwiller wavefunction, and the multi-configurational time-dependent Hartree method, our approach does not require quantum Monte Carlo nor demanding computational power. Advisors/Committee Members: Caves, Carlton M., Landahl, Andrew, Miyake, Akimasa, Prasad, Sudhakar.

Subjects/Keywords: particle correlation; Bose-Einstein condensate

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APA (6^th Edition):

Jiang, Z. (2014). Particle Correlations in Bose-Einstein Condensates. (Doctoral Dissertation). University of New Mexico. Retrieved from http://hdl.handle.net/1928/24564

Chicago Manual of Style (16^th Edition):

Jiang, Zhang. “Particle Correlations in Bose-Einstein Condensates.” 2014. Doctoral Dissertation, University of New Mexico. Accessed April 10, 2021. http://hdl.handle.net/1928/24564.

MLA Handbook (7^th Edition):

Jiang, Zhang. “Particle Correlations in Bose-Einstein Condensates.” 2014. Web. 10 Apr 2021.

Vancouver:

Jiang Z. Particle Correlations in Bose-Einstein Condensates. [Internet] [Doctoral dissertation]. University of New Mexico; 2014. [cited 2021 Apr 10]. Available from: http://hdl.handle.net/1928/24564.

Council of Science Editors:

Jiang Z. Particle Correlations in Bose-Einstein Condensates. [Doctoral Dissertation]. University of New Mexico; 2014. Available from: http://hdl.handle.net/1928/24564

Georgia Tech

4. Vinit, Anshuman. Investigating non-equilibrium phenomena in spinor antiferromagnetic Bose-Einstein condensates.

Degree: PhD, Physics, 2016, Georgia Tech

URL: http://hdl.handle.net/1853/55621

► This thesis discusses non-equilibrium phenomena in antiferromagnetic spinor quantum gases. We investigate, both experimentally and theoretically, the quench dynamics of antiferromagnetic spinor Bose-Einstein condensates in… (more)

▼ This thesis discusses non-equilibrium phenomena in antiferromagnetic spinor quantum gases. We investigate, both experimentally and theoretically, the quench dynamics of antiferromagnetic spinor Bose-Einstein condensates in the vicinity of a zero temperature quantum phase transition. A microwave dressing field was used as a novel tool to access the polar to antiferrmagnetic quantum phase transition at the quadratic Zeeman shift, q=0. By performing instantaneous quenches across the phase transition,a dynamical instability was induced in the atomic cloud. This lead to pair formation and rapid amplification of spin +/-1 atoms through spin-mixing collisions. The spatial ordering kinetics in the vicinity of the phase transition was quantified by performing the local spin measurement. The coarsening dynamics was observed for the instability for q < 0, as it nucleated small domains that grew to the axial size of the cloud. Rich nonequilibrium behavior was observed in the form of growth and decay of both nematic and magnetic spin waves, following the quench. The spatiotemporal evolution was characterized through two particle correlations between atoms in each pair of spin states, which revealed dramatic differences between the dynamics of the spin correlations and those of the spin populations. Finally, we demonstrate the remarkable influence of linear Zeeman term on non-equilibrium dynamics of spinor Bose-Einstein condensates. We show that contrary to prior understanding magnetic field gradient actually suppresses the tendency of spin 0 state to separate into spin +/-1 state. This reconciles the Bogoliubov discrepancies and leads to a dramatic sharpening of the transition point, resulting in a resolution at the 1 Hz level. Our results point to the use of dynamics, rather than equilibrium quantities for high precision measurements of phase transitions in quantum gases. Advisors/Committee Members: Raman, Chandra (advisor), Chapman, Michael (committee member), Trebino, Rick (committee member), First, Philip (committee member), Amini, Jason (committee member).

Subjects/Keywords: Spinor; Bose-Einstein condensate

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Vinit, A. (2016). Investigating non-equilibrium phenomena in spinor antiferromagnetic Bose-Einstein condensates. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/55621

Chicago Manual of Style (16^th Edition):

Vinit, Anshuman. “Investigating non-equilibrium phenomena in spinor antiferromagnetic Bose-Einstein condensates.” 2016. Doctoral Dissertation, Georgia Tech. Accessed April 10, 2021. http://hdl.handle.net/1853/55621.

MLA Handbook (7^th Edition):

Vinit, Anshuman. “Investigating non-equilibrium phenomena in spinor antiferromagnetic Bose-Einstein condensates.” 2016. Web. 10 Apr 2021.

Vancouver:

Vinit A. Investigating non-equilibrium phenomena in spinor antiferromagnetic Bose-Einstein condensates. [Internet] [Doctoral dissertation]. Georgia Tech; 2016. [cited 2021 Apr 10]. Available from: http://hdl.handle.net/1853/55621.

Council of Science Editors:

Vinit A. Investigating non-equilibrium phenomena in spinor antiferromagnetic Bose-Einstein condensates. [Doctoral Dissertation]. Georgia Tech; 2016. Available from: http://hdl.handle.net/1853/55621

University of Otago

5. Cormack, Samuel Christopher. Dipoles and Disorder: Applications of Hartree-Fock-Bogoliubov Theory .

Degree: 2013, University of Otago

URL: http://hdl.handle.net/10523/3933

► We apply the Hartree-Fock-Bogoliubov-Popov (HFBP) method to two problems. The first is the phenomenon of Anderson localisation of a BEC in a two-dimensional bichromatic lattice.… (more)

Subjects/Keywords: Bose-Einstein; condensate; BEC; dipolar; interactions; Anderson; localization; HFB; Hartree-Fock-Bogoliubov; finite; temperature; lattice; bosons

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APA (6^th Edition):

Cormack, S. C. (2013). Dipoles and Disorder: Applications of Hartree-Fock-Bogoliubov Theory . (Masters Thesis). University of Otago. Retrieved from http://hdl.handle.net/10523/3933

Chicago Manual of Style (16^th Edition):

Cormack, Samuel Christopher. “Dipoles and Disorder: Applications of Hartree-Fock-Bogoliubov Theory .” 2013. Masters Thesis, University of Otago. Accessed April 10, 2021. http://hdl.handle.net/10523/3933.

MLA Handbook (7^th Edition):

Cormack, Samuel Christopher. “Dipoles and Disorder: Applications of Hartree-Fock-Bogoliubov Theory .” 2013. Web. 10 Apr 2021.

Vancouver:

Cormack SC. Dipoles and Disorder: Applications of Hartree-Fock-Bogoliubov Theory . [Internet] [Masters thesis]. University of Otago; 2013. [cited 2021 Apr 10]. Available from: http://hdl.handle.net/10523/3933.

Council of Science Editors:

Cormack SC. Dipoles and Disorder: Applications of Hartree-Fock-Bogoliubov Theory . [Masters Thesis]. University of Otago; 2013. Available from: http://hdl.handle.net/10523/3933

Universiteit Utrecht

6. Sponselee, K.C. Characterisation of Transport in Bose-Einstein Condensates Below and Above the Critical Velocity.

Degree: 2016, Universiteit Utrecht

URL: http://dspace.library.uu.nl:8080/handle/1874/337060

► Five experiments are performed to characterise the time development of the chemical potential and temperature of a bimodal Bose-condensed gas. The ﬁve experiments are a… (more)

Subjects/Keywords: Bose-Einstein Condensation; Bose-Einstein Condensate; BEC; Superfluidity; Critical velocity

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APA (6^th Edition):

Sponselee, K. C. (2016). Characterisation of Transport in Bose-Einstein Condensates Below and Above the Critical Velocity. (Masters Thesis). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/337060

Chicago Manual of Style (16^th Edition):

Sponselee, K C. “Characterisation of Transport in Bose-Einstein Condensates Below and Above the Critical Velocity.” 2016. Masters Thesis, Universiteit Utrecht. Accessed April 10, 2021. http://dspace.library.uu.nl:8080/handle/1874/337060.

MLA Handbook (7^th Edition):

Sponselee, K C. “Characterisation of Transport in Bose-Einstein Condensates Below and Above the Critical Velocity.” 2016. Web. 10 Apr 2021.

Vancouver:

Sponselee KC. Characterisation of Transport in Bose-Einstein Condensates Below and Above the Critical Velocity. [Internet] [Masters thesis]. Universiteit Utrecht; 2016. [cited 2021 Apr 10]. Available from: http://dspace.library.uu.nl:8080/handle/1874/337060.

Council of Science Editors:

Sponselee KC. Characterisation of Transport in Bose-Einstein Condensates Below and Above the Critical Velocity. [Masters Thesis]. Universiteit Utrecht; 2016. Available from: http://dspace.library.uu.nl:8080/handle/1874/337060

7. Arnol Daniel Garcia Orozco. Efeito da turbulência quântica na expansão livre de um superfluido atômico.

Degree: 2018, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/76/76131/tde-02102018-100959/

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Neste trabalho, estudamos o efeito da turbulência quântica na expansão livre do condensado de Bose-Einstein de 87Rb. O BEC é produzido em uma armadilha magnética… (more)

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Neste trabalho, estudamos o efeito da turbulência quântica na expansão livre do condensado de Bose-Einstein de 87Rb. O BEC é produzido em uma armadilha magnética tipo QUIC, em seguida o condensado é perturbado através da aplicação de um campo magnético. A superposição de campos magnéticos excita os modos coletivos em condições de baixa amplitude de excitação. No entanto para altas amplitudes de excitação, foi possível observar também outros efeitos, tais como: a variação do perfil de densidade e a diminuição na taxa de expansão dos átomos. A distribuição de momento dos átomos perturbados, indica a presença de turbulência quântica no superfluido caracterizada por uma cascata de energia dentro da faixa inercial. Os resultados da expansão livre do BEC mostram a variação do perfil de distribuição de densidade dos átomos evoluindo de um perfil Gaussiano a um perfil exponencial para altas amplitudes de excitação. O mesmo efeito foi observado ao aumentar o tempo de excitação na condição de baixas amplitudes de excitação. Além da variação do perfil de distribuição de densidade, a taxa da expansão dos átomos não perturbados é maior do que os átomos perturbados, apresentando a ocorrência de uma diminuição anisotrópica, significativa, da velocidade dos átomos durante a expansão livre. A diminuição da taxa de expansão pode estar relacionado com o fenômeno de localização durante a expansão livre dos átomos.

In this work, we study the effect of quantum turbulence on the free expansion of the Bose-Einstein condensate of 87Rb. The BEC is produced in a quic magnetic trap, then the condensate is disturbed by the application of a magnetic field. Superposition of magnetic fields excites collective modes under conditions of low amplitude of excitation. However, for high amplitudes of excitation, it was possible to observe other effects, such as: the variation of the density profile and the decrease in the rate of expansion of the atoms. The momentum distribution of the perturbed atoms indicates the presence of quantum turbulence in the superfluid characterized by a cascade of energy within the inertial band. The results of the free expansion of the BEC show the variation of the density distribution profile of the atoms evolving from a Gaussian profile to an exponential profile for high excitation amplitudes. The same effect was observed by increasing the excitation time in the condition of low excitation amplitudes. In addition to the variation of the density distribution profile, the rate of expansion of the undisturbed atoms is greater than the perturbed atoms, with the occurrence of a significant anisotropic decrease in the velocity of the atoms during free expansion. The decrease in the rate of expansion may be related to the localization phenomenon during the free expansion of the atoms.

Advisors/Committee Members: Vanderlei Salvador Bagnato, Antonio Vidiella Barranco, Rodrigo Figueiredo Shiozaki.

Subjects/Keywords: Condensado de Bose-Einstein; Localização; Turbulência; Bose-Einstein condensate; Localization; Turbulence

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APA (6^th Edition):

Orozco, A. D. G. (2018). Efeito da turbulência quântica na expansão livre de um superfluido atômico. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/76/76131/tde-02102018-100959/

Chicago Manual of Style (16^th Edition):

Orozco, Arnol Daniel Garcia. “Efeito da turbulência quântica na expansão livre de um superfluido atômico.” 2018. Masters Thesis, University of São Paulo. Accessed April 10, 2021. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-02102018-100959/.

MLA Handbook (7^th Edition):

Orozco, Arnol Daniel Garcia. “Efeito da turbulência quântica na expansão livre de um superfluido atômico.” 2018. Web. 10 Apr 2021.

Vancouver:

Orozco ADG. Efeito da turbulência quântica na expansão livre de um superfluido atômico. [Internet] [Masters thesis]. University of São Paulo; 2018. [cited 2021 Apr 10]. Available from: http://www.teses.usp.br/teses/disponiveis/76/76131/tde-02102018-100959/.

Council of Science Editors:

Orozco ADG. Efeito da turbulência quântica na expansão livre de um superfluido atômico. [Masters Thesis]. University of São Paulo; 2018. Available from: http://www.teses.usp.br/teses/disponiveis/76/76131/tde-02102018-100959/

8. Wishahi, Franziska. Polariton condensates in a semiconductor microcavity influenced by all-optical methods.

Degree: 2013, Technische Universität Dortmund

URL: http://hdl.handle.net/2003/30604

► It is hard to picture today's society without fast data exchange, in private and business matters. This revolution in telecommunication is to a large extent… (more)

Subjects/Keywords: Bose-Einstein condensate; Polariton; Semiconductor microcavity; 530

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wishahi, F. (2013). Polariton condensates in a semiconductor microcavity influenced by all-optical methods. (Thesis). Technische Universität Dortmund. Retrieved from http://hdl.handle.net/2003/30604

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wishahi, Franziska. “Polariton condensates in a semiconductor microcavity influenced by all-optical methods.” 2013. Thesis, Technische Universität Dortmund. Accessed April 10, 2021. http://hdl.handle.net/2003/30604.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wishahi, Franziska. “Polariton condensates in a semiconductor microcavity influenced by all-optical methods.” 2013. Web. 10 Apr 2021.

Vancouver:

Wishahi F. Polariton condensates in a semiconductor microcavity influenced by all-optical methods. [Internet] [Thesis]. Technische Universität Dortmund; 2013. [cited 2021 Apr 10]. Available from: http://hdl.handle.net/2003/30604.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wishahi F. Polariton condensates in a semiconductor microcavity influenced by all-optical methods. [Thesis]. Technische Universität Dortmund; 2013. Available from: http://hdl.handle.net/2003/30604

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

9. Wishahi, Franziska. Polariton condensates in a semiconductor microcavity influenced by all-optical methods.

Degree: 2013, Technische Universität Dortmund

URL: http://dx.doi.org/10.17877/DE290R-14866

► It is hard to picture today's society without fast data exchange, in private and business matters. This revolution in telecommunication is to a large extent… (more)

Subjects/Keywords: Bose-Einstein condensate; Polariton; Semiconductor microcavity; 530

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wishahi, F. (2013). Polariton condensates in a semiconductor microcavity influenced by all-optical methods. (Doctoral Dissertation). Technische Universität Dortmund. Retrieved from http://dx.doi.org/10.17877/DE290R-14866

Chicago Manual of Style (16^th Edition):

Wishahi, Franziska. “Polariton condensates in a semiconductor microcavity influenced by all-optical methods.” 2013. Doctoral Dissertation, Technische Universität Dortmund. Accessed April 10, 2021. http://dx.doi.org/10.17877/DE290R-14866.

MLA Handbook (7^th Edition):

Wishahi, Franziska. “Polariton condensates in a semiconductor microcavity influenced by all-optical methods.” 2013. Web. 10 Apr 2021.

Vancouver:

Wishahi F. Polariton condensates in a semiconductor microcavity influenced by all-optical methods. [Internet] [Doctoral dissertation]. Technische Universität Dortmund; 2013. [cited 2021 Apr 10]. Available from: http://dx.doi.org/10.17877/DE290R-14866.

Council of Science Editors:

Wishahi F. Polariton condensates in a semiconductor microcavity influenced by all-optical methods. [Doctoral Dissertation]. Technische Universität Dortmund; 2013. Available from: http://dx.doi.org/10.17877/DE290R-14866

University of Colorado

10. Klauss, Catherine Ellen. Resonantly Interacting Degenerate Bose Gas Oddities.

Degree: PhD, 2017, University of Colorado

URL: https://scholar.colorado.edu/phys_gradetds/208

► The progression from two- through few- to many-body physics is an open and interesting question. Experiments that can test these theories must walk the… (more)

Subjects/Keywords: Bose-Einstein condensate; Efimov; Feshbach; ultracold; Physics

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APA (6^th Edition):

Klauss, C. E. (2017). Resonantly Interacting Degenerate Bose Gas Oddities. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/phys_gradetds/208

Chicago Manual of Style (16^th Edition):

Klauss, Catherine Ellen. “Resonantly Interacting Degenerate Bose Gas Oddities.” 2017. Doctoral Dissertation, University of Colorado. Accessed April 10, 2021. https://scholar.colorado.edu/phys_gradetds/208.

MLA Handbook (7^th Edition):

Klauss, Catherine Ellen. “Resonantly Interacting Degenerate Bose Gas Oddities.” 2017. Web. 10 Apr 2021.

Vancouver:

Klauss CE. Resonantly Interacting Degenerate Bose Gas Oddities. [Internet] [Doctoral dissertation]. University of Colorado; 2017. [cited 2021 Apr 10]. Available from: https://scholar.colorado.edu/phys_gradetds/208.

Council of Science Editors:

Klauss CE. Resonantly Interacting Degenerate Bose Gas Oddities. [Doctoral Dissertation]. University of Colorado; 2017. Available from: https://scholar.colorado.edu/phys_gradetds/208

University of Rochester

11. Murphree, Joseph D. Quadrupole Raman transitions driven by optical vortex beams in ultracold atomic clouds.

Degree: PhD, 2020, University of Rochester

URL: http://hdl.handle.net/1802/35982

► Recent experiments in trapped ions demonstrate that a circularly polarized Laguerre– Gaussian (LG) beam carrying orbital angular momentum (OAM) can transfer both components of its… (more)

Subjects/Keywords: Bose-Einstein condensate; Quadrupole transition; Raman process

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APA (6^th Edition):

Murphree, J. D. (2020). Quadrupole Raman transitions driven by optical vortex beams in ultracold atomic clouds. (Doctoral Dissertation). University of Rochester. Retrieved from http://hdl.handle.net/1802/35982

Chicago Manual of Style (16^th Edition):

Murphree, Joseph D. “Quadrupole Raman transitions driven by optical vortex beams in ultracold atomic clouds.” 2020. Doctoral Dissertation, University of Rochester. Accessed April 10, 2021. http://hdl.handle.net/1802/35982.

MLA Handbook (7^th Edition):

Murphree, Joseph D. “Quadrupole Raman transitions driven by optical vortex beams in ultracold atomic clouds.” 2020. Web. 10 Apr 2021.

Vancouver:

Murphree JD. Quadrupole Raman transitions driven by optical vortex beams in ultracold atomic clouds. [Internet] [Doctoral dissertation]. University of Rochester; 2020. [cited 2021 Apr 10]. Available from: http://hdl.handle.net/1802/35982.

Council of Science Editors:

Murphree JD. Quadrupole Raman transitions driven by optical vortex beams in ultracold atomic clouds. [Doctoral Dissertation]. University of Rochester; 2020. Available from: http://hdl.handle.net/1802/35982

University of Toronto

12. Ellenor, Christopher William. Bose-Einstein Condensate Wavefunction Reconstruction Through Collisions with Optical Potentials.

Degree: 2011, University of Toronto

URL: http://hdl.handle.net/1807/29715

►

A new technique for the interferometric measurement of an atomic wavefunction is introduced theoretically, which is able to extract phase and amplitude information in a… (more)

Subjects/Keywords: Bose-Einstein Condensate; wavefunction; 0752; 0611

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ellenor, C. W. (2011). Bose-Einstein Condensate Wavefunction Reconstruction Through Collisions with Optical Potentials. (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/29715

Chicago Manual of Style (16^th Edition):

Ellenor, Christopher William. “Bose-Einstein Condensate Wavefunction Reconstruction Through Collisions with Optical Potentials.” 2011. Doctoral Dissertation, University of Toronto. Accessed April 10, 2021. http://hdl.handle.net/1807/29715.

MLA Handbook (7^th Edition):

Ellenor, Christopher William. “Bose-Einstein Condensate Wavefunction Reconstruction Through Collisions with Optical Potentials.” 2011. Web. 10 Apr 2021.

Vancouver:

Ellenor CW. Bose-Einstein Condensate Wavefunction Reconstruction Through Collisions with Optical Potentials. [Internet] [Doctoral dissertation]. University of Toronto; 2011. [cited 2021 Apr 10]. Available from: http://hdl.handle.net/1807/29715.

Council of Science Editors:

Ellenor CW. Bose-Einstein Condensate Wavefunction Reconstruction Through Collisions with Optical Potentials. [Doctoral Dissertation]. University of Toronto; 2011. Available from: http://hdl.handle.net/1807/29715

Colorado School of Mines

13. Alotaibi, Majed O. D. Dark-bright solitons in Bose-Einstein condensates: dynamics, scattering, and oscillation.

Degree: PhD, Physics, 2018, Colorado School of Mines

URL: http://hdl.handle.net/11124/172410

► In this thesis, we have studied the behavior of two-component dark-bright solitons in multicomponent Bose-Einstein condensates (BECs) analytically and numerically in different situations. We utilized… (more)

▼ In this thesis, we have studied the behavior of two-component dark-bright solitons in multicomponent Bose-Einstein condensates (BECs) analytically and numerically in different situations. We utilized various analytical methods including the variational method and perturbation theory. By imprinting a linear phase on the bright component only, we were able to impart a velocity relative to the dark component and thereby we obtain an internal oscillation between the two components. We find that there are two modes of the oscillation of the dark-bright soliton. The first one is the famous Goldstone mode. This mode represents a moving dark-bright soliton without internal oscillation and is related to the continuous translational symmetry of the underlying equations of motion in the uniform potential. The second mode is the oscillation of the two components relative to each other. We compared the results obtained from the variational method with numerical simulations and found that the oscillation frequency range is 90 to 405 Hz and therefore observable in multicomponent Bose-Einstein condensate experiments. Also, we studied the binding energy and found a critical value for the breakup of the dark-bright soliton. Building on these results, we have studied another situation where we have the dark-bright soliton oscillate in a harmonic potential. We found for weak trapping the internal modes are nearly independent of center of mass motion of the dark-bright soliton. In contrast, in tighter traps the internal modes couple strongly to the center of mass motion, showing that for dark-bright solitons in a harmonic potential the center of mass and relative degrees of freedom are not independent. We found this result is robust against noise in the initial condition and should, therefore, be experimentally observable. In addition, we have studied the interaction between a moving dark-bright soliton in a uniform background with internal oscillation and a fixed impurity, modeled by a delta function potential. The interaction excites different modes in the system. Our analytical model capture two of these modes: the relative oscillation between the two components, as well as the in-sync oscillation of the widths. The numerical simulations allow further internal modes like out-of-sync oscillations of the soliton widths and even shape deformations of various kinds. We identify regions in parameter space for the transmission, reflection and inelastic scattering of the dark-bright soliton by the potential barrier. We have studied the velocity of dark-bright solitons described with an ansatz that uses one center of mass variable to represent the position of the two components. We found for a dark-bright soliton the maximum velocity is limited by the relative number of atoms in the bright component as compared to the size of the hole or density notch created by the dark component. Above this critical velocity the dark-bright soliton develops internal oscillations, and eventually unbinds and breaks apart. Advisors/Committee Members: Carr, Lincoln D. (advisor), Martin, P. A. (committee member), Bernard, James (committee member), Ohno, Timothy R. (committee member), Wood, David M. (committee member).

Subjects/Keywords: nonlinear dynamics; Bose–Einstein condensate; soliton

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APA (6^th Edition):

Alotaibi, M. O. D. (2018). Dark-bright solitons in Bose-Einstein condensates: dynamics, scattering, and oscillation. (Doctoral Dissertation). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/172410

Chicago Manual of Style (16^th Edition):

Alotaibi, Majed O D. “Dark-bright solitons in Bose-Einstein condensates: dynamics, scattering, and oscillation.” 2018. Doctoral Dissertation, Colorado School of Mines. Accessed April 10, 2021. http://hdl.handle.net/11124/172410.

MLA Handbook (7^th Edition):

Alotaibi, Majed O D. “Dark-bright solitons in Bose-Einstein condensates: dynamics, scattering, and oscillation.” 2018. Web. 10 Apr 2021.

Vancouver:

Alotaibi MOD. Dark-bright solitons in Bose-Einstein condensates: dynamics, scattering, and oscillation. [Internet] [Doctoral dissertation]. Colorado School of Mines; 2018. [cited 2021 Apr 10]. Available from: http://hdl.handle.net/11124/172410.

Council of Science Editors:

Alotaibi MOD. Dark-bright solitons in Bose-Einstein condensates: dynamics, scattering, and oscillation. [Doctoral Dissertation]. Colorado School of Mines; 2018. Available from: http://hdl.handle.net/11124/172410

14. Alibert, Julien. Une nouvelle source pour l'interférométrie atomique avec un condensat de Bose-Einstein double espèce : Towards a new source for atom interferometry coith double species Bose Einstein condensate.

Degree: Docteur es, Physique, 2017, Université Toulouse III – Paul Sabatier

URL: http://www.theses.fr/2017TOU30350

►

L'interférométrie atomique a démontré sa capacité à effectuer des mesures de grande précision, notamment pour la réalisation de capteurs inertiels, les tests de physique fondamentale… (more)

▼

L'interférométrie atomique a démontré sa capacité à effectuer des mesures de grande précision, notamment pour la réalisation de capteurs inertiels, les tests de physique fondamentale ou la mesure de constantes fondamentales. Une piste pour l'amélioration de la sensibilité des interféromètres atomiques est la réduction de la dispersion en vitesse de la source en utilisant un ensemble d'atomes ultra-froids pour augmenter le temps d'interrogation des atomes et accroitre la séparation spatiale entre les bras de l'interféromètre. Un nouvel interféromètre atomique à bras séparés est en construction au Laboratoire Collisions Agrégats et Réactivité de Toulouse. Ce dispositif répond à deux objectifs. Premièrement sa conception a pour but l'étude et le développement de nouveaux types de sources de condensat de Bose-Einstein (C.B.E.) double espèce de rubidium 85 et 87 adaptées à l'interférométrie. Cette source de C.B.E. repose sur l'utilisation de puces pour la manipulation et le refroidissement des atomes. Cette technologie est compacte et consomment peu d'énergie, ce qui est adaptée aux applications spatiales. L'autre objectif est d'utiliser cet interféromètre pour tester la neutralité de la matière via l'effet Aharonov-Bohm scalaire. Dans ce manuscrit je commence par exposer et justifer les choix techniques fait lors du dimensionnement et de la construction de la source de C.B.E. double isotopes. Par la suite, je présente les premiers résultats expérimentaux accompagnés de simulations numériques et d'explications théoriques. Lors de la première étape de refroidissement laser nous produisons un nuage de rubidium 87 et 85 contenant 4 × 10¹⁰ atomes à une température de 10 µK avec un taux de cycle de 1 s. A la suite du refroidissement laser 8 × 10⁹ atomes sont chargés dans le piège magnétique millimétrique de surface. Différentes expériences de caractérisation sont réalisées et expliquées à la lumières de simulations numériques. L'étude des fréquences de piégeage et de la profondeur a révélé les limites du premier prototype de piège millimétrique que nous avons réalisé au laboratoire. Cependant ces développements expérimentaux et théoriques servent à développer et implémenter dans le dispositif une nouvelle génération de puce à échelle micrométrique.

Atom interferometry has shown its interest for high precision measurements, such as inertial sensors, tests of fundamental physics or fundamental constant measurements. A way to improve sensitivity of such device is to reduce speed dispersion of the atomic cloud. The use of ultra-cold atoms allows increasing the interogation time of atoms and the spatial separation between the interferometer arms. The building of a new atom interferometer with separated arms is ongoing in the laboratory "Collisions Agrégats et Réactivité" at Toulouse. This new setup must meet two objectives. One aim of its conception is to study and develop a new kind of double species Bose-Einstein condensate (B.E.C.) source for atom interferometry with rubidium 87 and 85. This B.E.C. source relies on atom…

Advisors/Committee Members: Guéry-Odelin, David (thesis director), Gauguet, Alexandre (thesis director).

Subjects/Keywords: Condensat de Bose-Einstein; Puce atomique; Interférométrie atomique; Bose Einstein condensate; Atom chip; Atom interferometry

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Alibert, J. (2017). Une nouvelle source pour l'interférométrie atomique avec un condensat de Bose-Einstein double espèce : Towards a new source for atom interferometry coith double species Bose Einstein condensate. (Doctoral Dissertation). Université Toulouse III – Paul Sabatier. Retrieved from http://www.theses.fr/2017TOU30350

Chicago Manual of Style (16^th Edition):

Alibert, Julien. “Une nouvelle source pour l'interférométrie atomique avec un condensat de Bose-Einstein double espèce : Towards a new source for atom interferometry coith double species Bose Einstein condensate.” 2017. Doctoral Dissertation, Université Toulouse III – Paul Sabatier. Accessed April 10, 2021. http://www.theses.fr/2017TOU30350.

MLA Handbook (7^th Edition):

Alibert, Julien. “Une nouvelle source pour l'interférométrie atomique avec un condensat de Bose-Einstein double espèce : Towards a new source for atom interferometry coith double species Bose Einstein condensate.” 2017. Web. 10 Apr 2021.

Vancouver:

Alibert J. Une nouvelle source pour l'interférométrie atomique avec un condensat de Bose-Einstein double espèce : Towards a new source for atom interferometry coith double species Bose Einstein condensate. [Internet] [Doctoral dissertation]. Université Toulouse III – Paul Sabatier; 2017. [cited 2021 Apr 10]. Available from: http://www.theses.fr/2017TOU30350.

Council of Science Editors:

Alibert J. Une nouvelle source pour l'interférométrie atomique avec un condensat de Bose-Einstein double espèce : Towards a new source for atom interferometry coith double species Bose Einstein condensate. [Doctoral Dissertation]. Université Toulouse III – Paul Sabatier; 2017. Available from: http://www.theses.fr/2017TOU30350

15. Achilleos, Vassos. Σολιτόνια σε μείγματα συμπυκνωμάτων Bose-Einstein.

Degree: 2015, National and Kapodistrian University of Athens; Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ)

URL: http://hdl.handle.net/10442/hedi/35296

►

The present thesis studies nonlinear matter waves in atomic Bose-Einstein condensate mixtures,composed of two different states of the same atomic species, and in particular, macroscopicnonlinear… (more)

▼

The present thesis studies nonlinear matter waves in atomic Bose-Einstein condensate mixtures,composed of two different states of the same atomic species, and in particular, macroscopicnonlinear excited states of the condensate, in the form of matter wave solitons. These excitationshave the form of: (a) a density dip in one component and a localized pulse in the othercomponent, (b) beating structures composed of a subsequent density dip and a density lumpin each component, (c) localized pulses in both components and (d) localized density dipsin each component. Solitons of type (a) and (b) were recently observed experimentally, inthe framework of the present thesis, as a result of the counterflow between the condensatecomponents. Solitons of type (c) and (d) are predicted and anaylized for the first time in asystem of binary condensates with spin-orbit interactions. The differnet types of solitonsare studied in the framework of the mean-field theory and in particular using a systemof two coupled Gross-Pitaevskii (GP) equations in (1+1) dimensions since the relevantepxeriments are perfomed in such a geometry. An analytical description of the form, thedynamics and the stability of the respective solitons is achieved, by developing novel perurbativeanalytical methods, based on the integrable limit of the corresponding GP equations. Numericalsimulations are also employed, and are found to be in a very good agreement with respectto the analytical results and the experimental findings.

Στην διατριβή αυτή μελετώνται μη γραμμικά υλικά κύματα σε μείγματα συμπυκνωμάτωνBose-Einstein αποτελούμενα από δυο διαφορετικές καταστάσεις του ίδιου είδους ατόμων.Ιδιαίτερα, μελετώνται οι μη γραμμικές μακροσκοπικές διεγερμένες καταστάσεις του μείγματος στη μορφή υλικών κυμάτων σολιτονίων. Οι διεγέρσεις αυτές έχουν τη μορφή σολι-τονίων που εμφανίζονται ως (α) βυθίσματα πυκνότητας στο ένα συστατικό, και ως εντοπισμένοι παλμοί στο άλλο συστατικό του μείγματος, (β) ταλαντούμενες δομές που αποτελούνται από διαδοχικά βυθίσματα και εξάρσεις πυκνότητας και στα δύο συστατικά, (γ)εντοπισμένους παλμούς και στα δύο συστατικά και (δ) βυθίσματα πυκνότητας και στα δύοσυστατικά. Τα σολιτόνια των τύπων (α) και (β) παρατηρήθηκαν πρόσφατα σε πειράματα«συμβολής» των δύο συστατικών του μείγματος, στο πλαίσιο της παρούσας διατριβής,ενώ τα σολιτόνια της μορφής (γ) και (δ) προβλέπονται και αναλύονται για πρώτη φοράσε μείγματα συμπυκνωμάτων με αλληλεπιδράσεις σπιν-τροχιάς, που μόλις πρόσφατα υλοποιήθηκαν πειραματικά. Όλες οι παραπάνω μορφές μη γραμμικών διεγέρσεων μελετώνταιχρησιμοποιώντας τη θεωρία μέσου πεδίου, και ειδικότερα ένα σύστημα από συζευγμένεςμη γραμμικές εξισώσεις Gross-Pitaevskii σε (1+1)-διαστάσεις, δεδομένου ότι και τα πειράματα έγιναν σε τέτοια γεωμετρία. Στο πλαίσιο αυτό επιτυγχάνεται η αναλυτική περιγραφήτης μορφής, της δυναμικής και της ευστάθειας των διαφόρων σολιτονικών δομών με χρήσηαναλυτικών τεχνικών που αναπτύχθηκαν για το μείγμα συμπυκνωμάτων. Επιπλέον, χρησιμοποιούνται αριθμητικές προσομοιώσεις, τα αποτελέσματα των οποίων βρίσκονται…

Subjects/Keywords: Σολιτόνια; Μη γραμμικά κύματα; Συμπυκνώματα Bose - Einstein; Solitons; Nonlinear waves; Bose-Einstein condensate

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Achilleos, V. (2015). Σολιτόνια σε μείγματα συμπυκνωμάτων Bose-Einstein. (Thesis). National and Kapodistrian University of Athens; Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ). Retrieved from http://hdl.handle.net/10442/hedi/35296

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Achilleos, Vassos. “Σολιτόνια σε μείγματα συμπυκνωμάτων Bose-Einstein.” 2015. Thesis, National and Kapodistrian University of Athens; Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ). Accessed April 10, 2021. http://hdl.handle.net/10442/hedi/35296.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Achilleos, Vassos. “Σολιτόνια σε μείγματα συμπυκνωμάτων Bose-Einstein.” 2015. Web. 10 Apr 2021.

Vancouver:

Achilleos V. Σολιτόνια σε μείγματα συμπυκνωμάτων Bose-Einstein. [Internet] [Thesis]. National and Kapodistrian University of Athens; Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ); 2015. [cited 2021 Apr 10]. Available from: http://hdl.handle.net/10442/hedi/35296.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Achilleos V. Σολιτόνια σε μείγματα συμπυκνωμάτων Bose-Einstein. [Thesis]. National and Kapodistrian University of Athens; Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ); 2015. Available from: http://hdl.handle.net/10442/hedi/35296

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Otago

16. Baillie, Daniel. Theory of cold dipolar and toroidal gases .

Degree: 2013, University of Otago

URL: http://hdl.handle.net/10523/3692

► We develop and apply meanfield methods to two systems of significant interest in cold atom physics. The first system, and the main subject of this… (more)

▼ We develop and apply meanfield methods to two systems of significant interest in cold atom physics. The first system, and the main subject of this thesis, is a gas of polarized dipoles, in which the particles have a long range anisotropic interaction. The second system is a toroidally trapped gas that interacts via short range interactions. Dipolar gases: We develop accurate techniques for dipolar Bose and Fermi gases accounting for both direct and exchange interactions. We detail an efficient numerical implementation of the meanfield treatment. We study the thermodynamic and the first and second order correlation properties of the system. We find that exchange interactions cause the correlation functions to be anisotropic in the low temperature regime. We also find that many uniform gas thermodynamic predictions, for which direct interaction effects vanish, are qualitatively unreliable for trapped systems, most notably for oblate traps. Using Hartree-Fock theory and analytic approximations, we examine the magnetostrictive position and momentum space distortions that occur in harmonically confined dipolar Bose and Fermi gases. The Bose gas momentum distribution distorts in the opposite sense to that of the Fermi gas. By relating exchange effects to short range correlations between the particles we discuss the energetic origin of this difference. Introducing local momentum distortion fields, we develop a practical Hartree-Fock theory in which exchange effects are described by a local effective potential. This theory is applicable at zero and finite temperature, and is in excellent agreement with full Hartree-Fock calculations. Contact gases: We show how considerable simplification of numerical results and analytical derivations can be achieved in the local density approximation using a variety of density of states techniques. We examine the process of isentropic loading of a Bose or Fermi gas from a harmonic trap into the scale invariant toroidal regime that exhibits a high degree of system invariance when increasing the radius of the toroid. For bosons a regime of cooling is identified and we find that the Fermi gas is subjected to irreducible heating during loading, caused by the loss of one degree of freedom for thermalization. Advisors/Committee Members: Blakie, Peter Blair (advisor).

Subjects/Keywords: Bose-Einstein condensation; dipolar gases; Fermi gases; toroidal gases

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APA (6^th Edition):

Baillie, D. (2013). Theory of cold dipolar and toroidal gases . (Doctoral Dissertation). University of Otago. Retrieved from http://hdl.handle.net/10523/3692

Chicago Manual of Style (16^th Edition):

Baillie, Daniel. “Theory of cold dipolar and toroidal gases .” 2013. Doctoral Dissertation, University of Otago. Accessed April 10, 2021. http://hdl.handle.net/10523/3692.

MLA Handbook (7^th Edition):

Baillie, Daniel. “Theory of cold dipolar and toroidal gases .” 2013. Web. 10 Apr 2021.

Vancouver:

Baillie D. Theory of cold dipolar and toroidal gases . [Internet] [Doctoral dissertation]. University of Otago; 2013. [cited 2021 Apr 10]. Available from: http://hdl.handle.net/10523/3692.

Council of Science Editors:

Baillie D. Theory of cold dipolar and toroidal gases . [Doctoral Dissertation]. University of Otago; 2013. Available from: http://hdl.handle.net/10523/3692

University of Otago

17. Bisset, Russell Nathan. Theoretical Study of the Trapped Dipolar Bose Gas in the Ultra-Cold Regime .

Degree: 2013, University of Otago

URL: http://hdl.handle.net/10523/4253

► The work of this thesis concerns the properties of a Bose gas of polarised dipoles that have long-range and anisotropic interactions. Our work is divided… (more)

▼ The work of this thesis concerns the properties of a Bose gas of polarised dipoles that have long-range and anisotropic interactions. Our work is divided into two parts. First, the stability of a dipolar Bose gas at finite temperature (both above and below the critical Bose-Einstein condensation (BEC) temperature Tc). Second, the fluctuations of a dipolar BEC at zero and small finite temperature (T ≪ Tc) in a regime where rotonic excitations emerge. Part I: Stability of a Trapped Finite Temperature Dipolar Bose Gas: Above Tc we implement a semiclassical Hartree-Fock theory and characterise the dependence of the stability boundary on temperature, trap geometry and the strength of the dipole-dipole interaction and contact interaction. We find that stability is greatly enhanced above Tc and that trap geometry continues to play a key role. Furthermore, we find that for oblate traps a novel double instability feature emerges. To extend our stability analysis to the low temperature regime, T < Tc, we develop a beyond semiclassical Hartree theory. We use this to characterise the stability boundary as a function of geometry. Interestingly, we find large beyond semiclassical effects above Tc for prolate trapping geometries. We characterise thermal effects on biconcave condensate states. Part II: Rotons and Fluctuations in a Trapped Dipolar Condensate: To study density fluctuations we implement a numerical scheme to solve the Gross-Pitaevskii equation and the Bogoliubov de Gennes equations. We find that the phonon and roton gases spatially separate and we characterise the role of the anomalous density on the density fluctuations of the thermally activated rotons. We develop a numerical scheme that calculates number fluctuations within cells of various shapes and sizes, and find a strong peak in the fluctuations when the cell size is around half the roton wavelength, which should be detectable by current experiments. By tailoring the cell shape we predict that experiments should be able to detect the effects of individual roton modes. For the study of zero temperature fluctuations we deploy the Gross-Pitaevskii and Bogoliubov de Gennes equations to calculate the dynamic and static structure factors for a highly oblate BEC. We find a clear signature of the roton gas dispersion relation within the structure factors. This signature should be detectible in current experiments using Bragg spectroscopy. Advisors/Committee Members: Blakie, P. Blair, Ballagh, Rob (advisor).

Subjects/Keywords: BEC; Bose-Einstein condensation; dipolar; dipole-dipole interactions; roton

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APA (6^th Edition):

Bisset, R. N. (2013). Theoretical Study of the Trapped Dipolar Bose Gas in the Ultra-Cold Regime . (Doctoral Dissertation). University of Otago. Retrieved from http://hdl.handle.net/10523/4253

Chicago Manual of Style (16^th Edition):

Bisset, Russell Nathan. “Theoretical Study of the Trapped Dipolar Bose Gas in the Ultra-Cold Regime .” 2013. Doctoral Dissertation, University of Otago. Accessed April 10, 2021. http://hdl.handle.net/10523/4253.

MLA Handbook (7^th Edition):

Bisset, Russell Nathan. “Theoretical Study of the Trapped Dipolar Bose Gas in the Ultra-Cold Regime .” 2013. Web. 10 Apr 2021.

Vancouver:

Bisset RN. Theoretical Study of the Trapped Dipolar Bose Gas in the Ultra-Cold Regime . [Internet] [Doctoral dissertation]. University of Otago; 2013. [cited 2021 Apr 10]. Available from: http://hdl.handle.net/10523/4253.

Council of Science Editors:

Bisset RN. Theoretical Study of the Trapped Dipolar Bose Gas in the Ultra-Cold Regime . [Doctoral Dissertation]. University of Otago; 2013. Available from: http://hdl.handle.net/10523/4253

Universiteit Utrecht

18. Vermeulen, A.T. Interference in a Bose-Einstein Condensate.

Degree: 2016, Universiteit Utrecht

URL: http://dspace.library.uu.nl:8080/handle/1874/337541

► A BEC can be viewed as a giant matter wave, this means that it can show interference. By creating a double-well potential we can split… (more)

Subjects/Keywords: BEC; interference; quantum; mechanics; Bose; Einstein; Condensate; optics; slm; waves; matter

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Vermeulen, A. T. (2016). Interference in a Bose-Einstein Condensate. (Masters Thesis). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/337541

Chicago Manual of Style (16^th Edition):

Vermeulen, A T. “Interference in a Bose-Einstein Condensate.” 2016. Masters Thesis, Universiteit Utrecht. Accessed April 10, 2021. http://dspace.library.uu.nl:8080/handle/1874/337541.

MLA Handbook (7^th Edition):

Vermeulen, A T. “Interference in a Bose-Einstein Condensate.” 2016. Web. 10 Apr 2021.

Vancouver:

Vermeulen AT. Interference in a Bose-Einstein Condensate. [Internet] [Masters thesis]. Universiteit Utrecht; 2016. [cited 2021 Apr 10]. Available from: http://dspace.library.uu.nl:8080/handle/1874/337541.

Council of Science Editors:

Vermeulen AT. Interference in a Bose-Einstein Condensate. [Masters Thesis]. Universiteit Utrecht; 2016. Available from: http://dspace.library.uu.nl:8080/handle/1874/337541

University of California – Berkeley

19. Olf, Ryan. Creating, imaging, and exploiting collective excitations of a multicomponent Bose-Einstein condensate.

Degree: Physics, 2015, University of California – Berkeley

URL: http://www.escholarship.org/uc/item/6gb1t6b9

► Ultracold atomic gas systems provide a remarkably versatile platform for studying a wide range of physical phenomena, from analogue particle physics and gravity, to the… (more)

Subjects/Keywords: Physics; Bose-Einstein condensate; entropy; magnons; nanokelvin; thermometry; ultracold

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APA (6^th Edition):

Olf, R. (2015). Creating, imaging, and exploiting collective excitations of a multicomponent Bose-Einstein condensate. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/6gb1t6b9

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Olf, Ryan. “Creating, imaging, and exploiting collective excitations of a multicomponent Bose-Einstein condensate.” 2015. Thesis, University of California – Berkeley. Accessed April 10, 2021. http://www.escholarship.org/uc/item/6gb1t6b9.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Olf, Ryan. “Creating, imaging, and exploiting collective excitations of a multicomponent Bose-Einstein condensate.” 2015. Web. 10 Apr 2021.

Vancouver:

Olf R. Creating, imaging, and exploiting collective excitations of a multicomponent Bose-Einstein condensate. [Internet] [Thesis]. University of California – Berkeley; 2015. [cited 2021 Apr 10]. Available from: http://www.escholarship.org/uc/item/6gb1t6b9.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Olf R. Creating, imaging, and exploiting collective excitations of a multicomponent Bose-Einstein condensate. [Thesis]. University of California – Berkeley; 2015. Available from: http://www.escholarship.org/uc/item/6gb1t6b9

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Rochester

20. Wright, Kevin C. (1976 - ). Stimulated Raman interactions in a Spinor Bose-Einstein condensate.

Degree: PhD, 2011, University of Rochester

URL: http://hdl.handle.net/1802/14425

► Dilute gases of alkali atoms are an ideal proving ground for testing our present understanding of quantum fluids and strongly correlated quantum systems. The ever-increasing… (more)

Subjects/Keywords: Bose-Einstein condensate; Vortices; Matter waves; Spinor; Two-photon

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APA (6^th Edition):

Wright, K. C. (. -. ). (2011). Stimulated Raman interactions in a Spinor Bose-Einstein condensate. (Doctoral Dissertation). University of Rochester. Retrieved from http://hdl.handle.net/1802/14425

Chicago Manual of Style (16^th Edition):

Wright, Kevin C (1976 - ). “Stimulated Raman interactions in a Spinor Bose-Einstein condensate.” 2011. Doctoral Dissertation, University of Rochester. Accessed April 10, 2021. http://hdl.handle.net/1802/14425.

MLA Handbook (7^th Edition):

Wright, Kevin C (1976 - ). “Stimulated Raman interactions in a Spinor Bose-Einstein condensate.” 2011. Web. 10 Apr 2021.

Vancouver:

Wright KC(-). Stimulated Raman interactions in a Spinor Bose-Einstein condensate. [Internet] [Doctoral dissertation]. University of Rochester; 2011. [cited 2021 Apr 10]. Available from: http://hdl.handle.net/1802/14425.

Council of Science Editors:

Wright KC(-). Stimulated Raman interactions in a Spinor Bose-Einstein condensate. [Doctoral Dissertation]. University of Rochester; 2011. Available from: http://hdl.handle.net/1802/14425

University of Washington

21. McAlpine, Katherine Elizabeth. Advancing Atom Interferometry with a Bloch-bands Approach.

Degree: PhD, 2020, University of Washington

URL: http://hdl.handle.net/1773/45254

► This work presents experiments and theory on ``magic depths" in Bloch oscillation acceleration pulses and the implications for advancing atom interferometry. For a particle in… (more)

Subjects/Keywords: Atom Interferometer; Bloch Oscillation; Bose-Einstein Condensate; Ultracold Atoms; Physics; Physics

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APA (6^th Edition):

McAlpine, K. E. (2020). Advancing Atom Interferometry with a Bloch-bands Approach. (Doctoral Dissertation). University of Washington. Retrieved from http://hdl.handle.net/1773/45254

Chicago Manual of Style (16^th Edition):

McAlpine, Katherine Elizabeth. “Advancing Atom Interferometry with a Bloch-bands Approach.” 2020. Doctoral Dissertation, University of Washington. Accessed April 10, 2021. http://hdl.handle.net/1773/45254.

MLA Handbook (7^th Edition):

McAlpine, Katherine Elizabeth. “Advancing Atom Interferometry with a Bloch-bands Approach.” 2020. Web. 10 Apr 2021.

Vancouver:

McAlpine KE. Advancing Atom Interferometry with a Bloch-bands Approach. [Internet] [Doctoral dissertation]. University of Washington; 2020. [cited 2021 Apr 10]. Available from: http://hdl.handle.net/1773/45254.

Council of Science Editors:

McAlpine KE. Advancing Atom Interferometry with a Bloch-bands Approach. [Doctoral Dissertation]. University of Washington; 2020. Available from: http://hdl.handle.net/1773/45254

22. Pudlik, Tadeusz. The open Bose-Hubbard dimer.

Degree: PhD, Physics, 2016, Boston University

URL: http://hdl.handle.net/2144/19214

► This dissertation discusses a number of theoretical models of coupled bosonic modes, all closely related to the Bose-Hubbard dimer. In studying these models, we will… (more)

▼ This dissertation discusses a number of theoretical models of coupled bosonic modes, all closely related to the Bose-Hubbard dimer. In studying these models, we will repeatedly return to two unifying themes: the classical structure underlying quantum dynamics and the impact of weakly coupling a system to an environment. Or, more succinctly, semiclassical methods and open quantum systems. Our primary motivation for studying models such as the Bose-Hubbard is their relevance to ongoing ultracold atom experiments. We review these experiments, derive the Bose-Hubbard model in their context and briefly discuss its limitations in the first half of Chapter 1. In its second half, we review the theory of open quantum systems and the master equation description of the dissipative Bose-Hubbard model. This opening chapter constitutes a survey of existing results, rather than original work. In Chapter 2, we turn to the mean-field limit of the Bose-Hubbard model. After reviewing the striking localization phenomena predicted by the mean-field (and confirmed by experiment), we identify the first corrections to this picture for the dimer. The most interesting of these is the dynamical tunneling between the self-trapping points of the mean-field. We derive an accurate analytical expression for the tunneling rate using semiclassical techniques. We continue studying the dynamics near the self-trapping fixed points in Chapter 3, focusing on corrections to the mean-field that arise at larger nonlinearities and on shorter time scales than dynamical tunneling. We study the impact of dissipation on coherence and entanglement near the fixed points, and explain it in terms of the structure of the classical phase space. The last chapter of the dissertation is also devoted to a dissipative bosonic dimer model, but one arising in a very different physical context. Abandoning optical lattices, we consider the problem of formulating a quantum model of operation of the cylindrical anode magnetron, a vacuum tube crossed-field microwave amplifier. We derive an effective dissipative dimer model and study its relationship to the classical description. Our dimer model is a first step towards the analysis of solid-state analogs of such devices.

Subjects/Keywords: Physics; Bose-Einstein condensate; Magnetron; Open quantum systems; Optical lattices

11 more images…

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APA (6^th Edition):

Pudlik, T. (2016). The open Bose-Hubbard dimer. (Doctoral Dissertation). Boston University. Retrieved from http://hdl.handle.net/2144/19214

Chicago Manual of Style (16^th Edition):

Pudlik, Tadeusz. “The open Bose-Hubbard dimer.” 2016. Doctoral Dissertation, Boston University. Accessed April 10, 2021. http://hdl.handle.net/2144/19214.

MLA Handbook (7^th Edition):

Pudlik, Tadeusz. “The open Bose-Hubbard dimer.” 2016. Web. 10 Apr 2021.

Vancouver:

Pudlik T. The open Bose-Hubbard dimer. [Internet] [Doctoral dissertation]. Boston University; 2016. [cited 2021 Apr 10]. Available from: http://hdl.handle.net/2144/19214.

Council of Science Editors:

Pudlik T. The open Bose-Hubbard dimer. [Doctoral Dissertation]. Boston University; 2016. Available from: http://hdl.handle.net/2144/19214

University of Colorado

23. Pino, Juan Manuel, II. Strongly Interacting Bose-Einstein Condensates: Probes and Techniques.

Degree: PhD, Physics, 2010, University of Colorado

URL: https://scholar.colorado.edu/psci_gradetds/4

► A dilute gas Bose-Einstein condensate (BEC) near a Feshbach resonance offers a system that can be tuned from the well-understood regime of weak interactions… (more)

Subjects/Keywords: BEC; Bose-Einstein Condensate; Feshbach; interacting; probe; superfluid; Physics

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APA (6^th Edition):

Pino, Juan Manuel, I. (2010). Strongly Interacting Bose-Einstein Condensates: Probes and Techniques. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/psci_gradetds/4

Chicago Manual of Style (16^th Edition):

Pino, Juan Manuel, II. “Strongly Interacting Bose-Einstein Condensates: Probes and Techniques.” 2010. Doctoral Dissertation, University of Colorado. Accessed April 10, 2021. https://scholar.colorado.edu/psci_gradetds/4.

MLA Handbook (7^th Edition):

Pino, Juan Manuel, II. “Strongly Interacting Bose-Einstein Condensates: Probes and Techniques.” 2010. Web. 10 Apr 2021.

Vancouver:

Pino, Juan Manuel I. Strongly Interacting Bose-Einstein Condensates: Probes and Techniques. [Internet] [Doctoral dissertation]. University of Colorado; 2010. [cited 2021 Apr 10]. Available from: https://scholar.colorado.edu/psci_gradetds/4.

Council of Science Editors:

Pino, Juan Manuel I. Strongly Interacting Bose-Einstein Condensates: Probes and Techniques. [Doctoral Dissertation]. University of Colorado; 2010. Available from: https://scholar.colorado.edu/psci_gradetds/4

University of St. Andrews

24. Bowman, David. Ultracold atoms in flexible holographic traps .

Degree: 2018, University of St. Andrews

URL: http://hdl.handle.net/10023/16293

► This thesis details the design, construction and characterisation of an ultracold atoms system, developed in conjunction with a flexible optical trapping scheme which utilises a… (more)

Subjects/Keywords: Atomic physics; Computer generated holograms; Bose-Einstein condensate; Spatial light modulators

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APA (6^th Edition):

Bowman, D. (2018). Ultracold atoms in flexible holographic traps . (Thesis). University of St. Andrews. Retrieved from http://hdl.handle.net/10023/16293

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Bowman, David. “Ultracold atoms in flexible holographic traps .” 2018. Thesis, University of St. Andrews. Accessed April 10, 2021. http://hdl.handle.net/10023/16293.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Bowman, David. “Ultracold atoms in flexible holographic traps .” 2018. Web. 10 Apr 2021.

Vancouver:

Bowman D. Ultracold atoms in flexible holographic traps . [Internet] [Thesis]. University of St. Andrews; 2018. [cited 2021 Apr 10]. Available from: http://hdl.handle.net/10023/16293.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bowman D. Ultracold atoms in flexible holographic traps . [Thesis]. University of St. Andrews; 2018. Available from: http://hdl.handle.net/10023/16293

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Maryland

25. Wang, Yi-Hsieh. Pair creation and pair annihilation in Bose-Einstein condensates.

Degree: Chemical Physics, 2017, University of Maryland

URL: http://hdl.handle.net/1903/19497

► This thesis covers three applications of Bose-Einstein condensates and related phenomena, in the theme of pair creation and pair annihilation. First, Bose-Einstein condensates (BEC) are… (more)

▼ This thesis covers three applications of Bose-Einstein condensates and related phenomena, in the theme of pair creation and pair annihilation. First, Bose-Einstein condensates (BEC) are viewed as one of the candidates to implement a sonic black hole. This can lead to the observation of analog Hawking radiation, resulting from a phonon pair creation at a black-hole horizon (BH). Such implementation has been achieved in a resent experiment by J. Steinhauer, in which a black-hole/white-hole pair has been produced. He also reported the observations of self-amplifying Hawking radiation, via a lasing mechanism operating between the black and white-hole horizons. Through our simulations, we find that the observations should be attributed not to the black hole laser effect, but rather to a growing zero-frequency bow wave, generated at the white-hole horizon. The relative motion of the two horizons produces a Doppler shift of the bow wave at the BH, where it stimulates a monochromatic Hawking radiation. We also find that shot-to-shot atom number variations and quantum fluctuations give density-density correlations consistent with those reported in the experiments. In particular, atom number variations can produce a spurious correlation signal. Secondly, a sonic black hole/white hole pair and phonon pair creation can also be realized using a ring-shaped condensate. Here we focus on the phonon spectroscopy of a ring condensate. We probe the phonon excitation spectrum by applying a harmonically driven barrier to a 23Na Bose-Einstein condensate in a ring-shaped trap. When excited resonantly, these wavepackets display a regular periodic structure. The resonant frequencies depend upon the particular configuration of the barrier, but are commensurate with the orbital frequency of a sound wave traveling around the ring. Energy transfer to the condensate over many cycles of the periodic wavepacket motion causes enhanced atom loss from the trap at resonant frequencies. Solutions of the Gross-Pitaevskii (GP) equation exhibit quantitative agreement with the experimental data. Thirdly, positronium (Ps) BECs have been of experimental and theoretical interest due to their potential application as the gain medium of a gamma-ray laser. Ps BECs are intrinsically spinor due to the presence of ortho- (o-Ps) and para-positronium (p-Ps), whose annihilation lifetimes differ by three orders of magnitude. We study the spinor dynamics and annihilation processes in the p-Ps/o-Ps system using both solutions of the GP equations and a rate-equation approach. For an initially unpolarized condensate, there is a threshold density at which spin mixing between o-Ps and p-Ps occurs. Beyond this threshold, there are unstable spatial modes accompanied by spin mixing. To ensure a high production yield above the critical density, a careful choice of external field must be made to avoid the spin mixing instability. Advisors/Committee Members: Clark, Charles W. (advisor), Jacobson, Theodore (advisor).

Subjects/Keywords: Physics; Black hole analog; Bose-Einstein condensate; Positronium; Ultracold atoms

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APA (6^th Edition):

Wang, Y. (2017). Pair creation and pair annihilation in Bose-Einstein condensates. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/19497

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wang, Yi-Hsieh. “Pair creation and pair annihilation in Bose-Einstein condensates.” 2017. Thesis, University of Maryland. Accessed April 10, 2021. http://hdl.handle.net/1903/19497.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wang, Yi-Hsieh. “Pair creation and pair annihilation in Bose-Einstein condensates.” 2017. Web. 10 Apr 2021.

Vancouver:

Wang Y. Pair creation and pair annihilation in Bose-Einstein condensates. [Internet] [Thesis]. University of Maryland; 2017. [cited 2021 Apr 10]. Available from: http://hdl.handle.net/1903/19497.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wang Y. Pair creation and pair annihilation in Bose-Einstein condensates. [Thesis]. University of Maryland; 2017. Available from: http://hdl.handle.net/1903/19497

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Colorado School of Mines

26. Strong, Scott A. Geometric quantum hydrodynamics and Bose-Einstein condensates: non-Hamiltonian evolution of vortex lines.

Degree: PhD, Physics, 2018, Colorado School of Mines

URL: http://hdl.handle.net/11124/172331

► Geometric quantum hydrodynamics merges geometric hydrodynamics with quantum hydrodynamics to study the geometric properties of vortex structures in superfluid states of matter. Here the vortex… (more)

▼ Geometric quantum hydrodynamics merges geometric hydrodynamics with quantum hydrodynamics to study the geometric properties of vortex structures in superfluid states of matter. Here the vortex line acts as the fundamental building block and is a topological defect of the fluid medium about which the otherwise irrotational fluid circulates. In this thesis, we show that except for the simplest fluid flows, a vortex line seeks to decompose localized regions of curvature into helical configurations. The simplest flow, known as the local induction approximation, is also an integrable one. Integrability makes the transfer of energy into helical modes impossible. In the following, we demonstrate that any arclength conserving correction to this approximation defines a non-Hamiltonian evolution of the vortex geometry, which is capable of supporting dissipative solitons and helical wavefronts. Quantum turbulence in ultracold vortex tangles relies on energy transfer between helical or Kelvin modes to decay. Thus, models of vortex lines beyond the lowest order integrable cases are vitally important to our mathematical description of free decay of turbulent tangles. To motivate the results of this thesis we connect our theory of vortex line dynamics to continuum fluid mechanics. The Navier-Stokes equations are a statement of momentum balance for a fluid whose response to shear stress is proportional to the fluid's velocity gradients. Building off of Onsager's rather obscure work in fluid turbulence, others have shown that solutions to Navier-Stokes limit to Euler evolutions of distributional velocity profiles for large Reynolds number. Using this as our context, we show that the Euler equation can be transformed, in an inverse Madelung sense, to the Gross-Pitaevskii equation associated with the mean-field quantum dynamics of a dilute Bose gas. This theory predicts that an irrotational fluid is capable of circulating around regions of density depletion known as vortex lines. Furthermore, if a vortex line is used as the ansatz for the Gross-Pitaevskii equation then it is possible to show that the Biot-Savart integral over the vortex source results. This connection between the vortex line geometry and the induced velocity field provides the basis for the application of geometric quantum hydrodynamics to Bose-Einstein condensates. If the Biot-Savart integral is the basis of geometric quantum hydrodynamics, then Hasimoto's transformation is the structure built on top. The fundamental theorem of space curves states that up to rotations and translations, a curve is defined by its curvature and torsion. Through the Hasimoto transformation, it is possible to map flows defined by the Biot-Savart integral to scalar partial differential equations evolving the curvature and torsion of a vortex line. In this thesis, we conduct an asymptotic expansion of the Biot-Savart integral and apply the Hasimoto transformation to show that vortex lines prefer to relax curved abnormalities through the excitation of helical waves along the vortex. Thus, our… Advisors/Committee Members: Carr, Lincoln D. (advisor), Martin, P. A. (committee member), Munakata Marr, Junko (committee member), Wood, David M. (committee member), Scales, John Alan (committee member).

Subjects/Keywords: Bose-Einstein condensate; superfluid; Biot-Savart integral; vortex line; Hasimoto transformation

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APA (6^th Edition):

Strong, S. A. (2018). Geometric quantum hydrodynamics and Bose-Einstein condensates: non-Hamiltonian evolution of vortex lines. (Doctoral Dissertation). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/172331

Chicago Manual of Style (16^th Edition):

Strong, Scott A. “Geometric quantum hydrodynamics and Bose-Einstein condensates: non-Hamiltonian evolution of vortex lines.” 2018. Doctoral Dissertation, Colorado School of Mines. Accessed April 10, 2021. http://hdl.handle.net/11124/172331.

MLA Handbook (7^th Edition):

Strong, Scott A. “Geometric quantum hydrodynamics and Bose-Einstein condensates: non-Hamiltonian evolution of vortex lines.” 2018. Web. 10 Apr 2021.

Vancouver:

Strong SA. Geometric quantum hydrodynamics and Bose-Einstein condensates: non-Hamiltonian evolution of vortex lines. [Internet] [Doctoral dissertation]. Colorado School of Mines; 2018. [cited 2021 Apr 10]. Available from: http://hdl.handle.net/11124/172331.

Council of Science Editors:

Strong SA. Geometric quantum hydrodynamics and Bose-Einstein condensates: non-Hamiltonian evolution of vortex lines. [Doctoral Dissertation]. Colorado School of Mines; 2018. Available from: http://hdl.handle.net/11124/172331

27. Fabricio de Souza Luiz. Implementação de portas lógicas quânticas em condensados de Bose- Einstein acoplados.

Degree: 2010, Federal University of Uberlândia

URL: http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=3066

►

Está bem estabelecido, que a dinâmica de dois condensados de Bose-Einstein (CBE) acoplados pode ser descrita usando o hamiltoniano de dois modos. Esse modelo, leva… (more)

Subjects/Keywords: Condensado de Bose-Einstein; Qubit; FISICA; Matéria condensada; Mecânica quântica; Portas logicas; Bose-Einstein condensate; Logic gates

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APA (6^th Edition):

Luiz, F. d. S. (2010). Implementação de portas lógicas quânticas em condensados de Bose- Einstein acoplados. (Thesis). Federal University of Uberlândia. Retrieved from http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=3066

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Luiz, Fabricio de Souza. “Implementação de portas lógicas quânticas em condensados de Bose- Einstein acoplados.” 2010. Thesis, Federal University of Uberlândia. Accessed April 10, 2021. http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=3066.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Luiz, Fabricio de Souza. “Implementação de portas lógicas quânticas em condensados de Bose- Einstein acoplados.” 2010. Web. 10 Apr 2021.

Vancouver:

Luiz FdS. Implementação de portas lógicas quânticas em condensados de Bose- Einstein acoplados. [Internet] [Thesis]. Federal University of Uberlândia; 2010. [cited 2021 Apr 10]. Available from: http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=3066.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Luiz FdS. Implementação de portas lógicas quânticas em condensados de Bose- Einstein acoplados. [Thesis]. Federal University of Uberlândia; 2010. Available from: http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=3066

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

28. Alamir, Ardavan. Dynamique des gaz quantiques ultrafroids dans des milieux aléatoires corrélés : Dynamics of ultracold quantum gases in correlated disordered potentials.

Degree: Docteur es, Physique, 2013, Nice

URL: http://www.theses.fr/2013NICE4126

►

La problématique de cette thèse est l'étude de la localisation d'un condensat de Bose-Einstein confiné harmoniquement et quasi-1D à travers lequel différents potentiels désordonnés sont… (more)

▼

La problématique de cette thèse est l'étude de la localisation d'un condensat de Bose-Einstein confiné harmoniquement et quasi-1D à travers lequel différents potentiels désordonnés sont transportés. Cette problématique qui se veut pleinement pertinente pour les expérimentalistes est à priori difficile à traiter. Cela est dû au caractère non-linéaire, inhomogène et hors-équilibre du système. De ce fait, la plage des vitesses du désordre est limitée d'une part par la vitesse critique de superfluidité et d'autre part par la configuration inhomogène du système. Des notions habituelles de localisation telles que transmission ou exposant de Lyapunov ne sont plus applicables. Donc, il a fallu apporter une nouvelle mesure de localisation pour notre problématique: le ratio du déplacement du centre de masse du condensat au déplacement du désordre qu'on a identifié à la fraction d'atomes localisés. De plus, nous avons des corrélations dans le désordre qui introduisent l'effet d'un comportement non-monotone de l'efficacité de la localisation du potentiel désordonné en fonction de l'énergie. Ainsi, les corrélations peuvent être un moyen pour mettre en évidence la nature quantique de la localisation. Chose que nous avont fait dans un premier temps avec du désordre de type Modèle d'Edwards et dans une seconde partie avec du désordre de type speckle, qu'on nomme le Random Dimer speckle. Pour ce deuxième cas, nous avons proposé une procédure pour contrôler les corrélations et introduire un pic de localisation dans une certaine région énergétique. Cette configuration pourrait être vérifié dans les expériences à l'aide d'un modulateur spatial de lumière.

The topic of this thesis is the study of localization of a quasi-one-dimensional and harmonically trapped Bose-Einstein condensate through which various disordered potentials are transported. This problem, which wants itself to be fully relevant to experimenters, is a priori difficult to deal with. This is due to the non-linear, inhomhogeneous and out-of-equilibrium nature of the system. Because of this, the range of speeds of disorder is limited on one side by the critical speed of superfluidity and on the other side by the inhomogeneous setting of the system. Usual notions of localization like transmission and Lyapunov exponent are no longer applicable. Thus, we had to introduce a novel measure of localization for our problem: the ratio of the distance moved by the condensate center of mass to the distance moved by the disordered potential that we identify as the fraction of localized atoms. Furthermore, we have correlations in the disorder that introduce the effect of non-monotonic behavior of the localization efficiency of the disordered potential as a function of energy. A a result, correlations can be used as a tool to point the quantum nature of the localization. We did this in a first part with Edwards Model type disorders and in a second part with speckle type disorders, a new one that we call the Random Dimer speckle. For this second part, we propose a scheme to control…

Advisors/Committee Members: Vignolo, Patrizia (thesis director).

Subjects/Keywords: Condensat de Bose-Einstein; Superfluidité; Désordre; Localisation d'Anderson; Corrélations; Speckle; Bose-Einstein condensate; BEC; Superfluidity; Disorder; Anderson localization; Correlations; Speckle

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Alamir, A. (2013). Dynamique des gaz quantiques ultrafroids dans des milieux aléatoires corrélés : Dynamics of ultracold quantum gases in correlated disordered potentials. (Doctoral Dissertation). Nice. Retrieved from http://www.theses.fr/2013NICE4126

Chicago Manual of Style (16^th Edition):

Alamir, Ardavan. “Dynamique des gaz quantiques ultrafroids dans des milieux aléatoires corrélés : Dynamics of ultracold quantum gases in correlated disordered potentials.” 2013. Doctoral Dissertation, Nice. Accessed April 10, 2021. http://www.theses.fr/2013NICE4126.

MLA Handbook (7^th Edition):

Alamir, Ardavan. “Dynamique des gaz quantiques ultrafroids dans des milieux aléatoires corrélés : Dynamics of ultracold quantum gases in correlated disordered potentials.” 2013. Web. 10 Apr 2021.

Vancouver:

Alamir A. Dynamique des gaz quantiques ultrafroids dans des milieux aléatoires corrélés : Dynamics of ultracold quantum gases in correlated disordered potentials. [Internet] [Doctoral dissertation]. Nice; 2013. [cited 2021 Apr 10]. Available from: http://www.theses.fr/2013NICE4126.

Council of Science Editors:

Alamir A. Dynamique des gaz quantiques ultrafroids dans des milieux aléatoires corrélés : Dynamics of ultracold quantum gases in correlated disordered potentials. [Doctoral Dissertation]. Nice; 2013. Available from: http://www.theses.fr/2013NICE4126

29. Gudyma, Andrii. Non-equilibrium dynamics of a trapped one-dimensional Bose gas : Dynamique hors d'équilibre de gaz de Bose unidimensionnel piégé.

Degree: Docteur es, Physique, 2015, Université Paris-Saclay (ComUE)

URL: http://www.theses.fr/2015SACLS064

►

Une étude des modes d'oscillations d'une gaz de Bose unidimensionnel dans la piège est présentée. Les oscillations sont initiées par une changement instantanée de la… (more)

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Une étude des modes d'oscillations d'une gaz de Bose unidimensionnel dans la piège est présentée. Les oscillations sont initiées par une changement instantanée de la fréquence de piégeage. Dans la thèse il est considéré d'un gaz de Bose quantique 1D dans un piège parabolique à la température nulle, et il est expliqué, analytiquement et numériquement, comment la fréquence d'oscillation dépend du nombre de particules, leur interaction répulsive, et les paramètres de piège. Nous sommes concentres sur la description spectrale, en utilisant les règles de somme. La fréquence d'oscillation est identifiée comme la différence d'énergie entre l'état fondamental et un état excité donne. L'existence de trois régimes est démontrée, à savoir le régime de Tonks, le régime de Thomas-Fermi et le régime de Gauss. La transition entre les régime de Tonks et de Thomas-Fermi est décrite dans l'approximation de la densité locale (LDA). Pour la transition entre le régime de Thomas-Fermi et le régime de Gauss l'approximation de Hartree est utilisée. Dans les deux cas, nous avons calculé les paramètres pour quelles les transitions se produisent. Les simulations extensif de Monte Carlo de diffusion pour un gaz contenant jusqu'à N = 25 particules ont été effectuées. Lorsque le nombre de particules augmente, les prédictions des simulations convergent vers celles d'Hartree et LDA dans ces régimes. Cela rend les résultats des modes d'oscillation applicables pour des valeurs arbitraires du nombre de particule et de l'interaction. L'analyse est complétée par les résultats perturbatifs dans les cas limites avec N finis. La théorie prédit le comportement réentrant de la fréquence de mode d'oscillation lors de la transition du régime de Tonks au régime de Gauss et explique bien les données de l'expérience récente du groupe d'Innsbruck.

A study of breathing oscillations of a one-dimensional trapped interacting Bose gas is presented. Oscillations are initiated by an instantaneous change of the trapping frequency. In the thesis a 1D quantum Bose gas in a parabolic trap at zero temperature is considered, and it is explained, analytically and numerically, how the oscillation frequency depends on the number of particles, their repulsive interaction, and the trap parameters. We have focused on the many-body spectral description, using the sum rules approximation. The oscillation frequency is identified as the energy difference between the ground state and a particular excited state. The existence of three regimes is demonstrated, namely the Tonks regime, the Thomas-Fermi regime and the Gaussian regime. The transition from the Tonks to the Thomas-Fermi regime is described in the terms of the local density approximation (LDA). For the description of the transition from the Thomas-Fermi to the Gaussian regime the Hartree approximation is used. In both cases the parameters where the transitions happen are found. The extensive diffusion Monte Carlo simulations for a gas containing up to N = 25 particles is performed. As the number of particles increases,…

Advisors/Committee Members: Shlyapnikov, Gora (thesis director).

Subjects/Keywords: Mode de respiration; Atomes froids; Condensat de Bose-Einstein; Breathing mode; Cold atoms; Bose-Einstein Condensate

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gudyma, A. (2015). Non-equilibrium dynamics of a trapped one-dimensional Bose gas : Dynamique hors d'équilibre de gaz de Bose unidimensionnel piégé. (Doctoral Dissertation). Université Paris-Saclay (ComUE). Retrieved from http://www.theses.fr/2015SACLS064

Chicago Manual of Style (16^th Edition):

Gudyma, Andrii. “Non-equilibrium dynamics of a trapped one-dimensional Bose gas : Dynamique hors d'équilibre de gaz de Bose unidimensionnel piégé.” 2015. Doctoral Dissertation, Université Paris-Saclay (ComUE). Accessed April 10, 2021. http://www.theses.fr/2015SACLS064.

MLA Handbook (7^th Edition):

Gudyma, Andrii. “Non-equilibrium dynamics of a trapped one-dimensional Bose gas : Dynamique hors d'équilibre de gaz de Bose unidimensionnel piégé.” 2015. Web. 10 Apr 2021.

Vancouver:

Gudyma A. Non-equilibrium dynamics of a trapped one-dimensional Bose gas : Dynamique hors d'équilibre de gaz de Bose unidimensionnel piégé. [Internet] [Doctoral dissertation]. Université Paris-Saclay (ComUE); 2015. [cited 2021 Apr 10]. Available from: http://www.theses.fr/2015SACLS064.

Council of Science Editors:

Gudyma A. Non-equilibrium dynamics of a trapped one-dimensional Bose gas : Dynamique hors d'équilibre de gaz de Bose unidimensionnel piégé. [Doctoral Dissertation]. Université Paris-Saclay (ComUE); 2015. Available from: http://www.theses.fr/2015SACLS064

30. Imanaliev, Almazbek. Towards testing Bell's inequality using atoms correlated in momentum : Vers la réalisation du test d’inégalité de Bell avec les atomes corrèle en impulsion.

Degree: Docteur es, Physique, 2016, Université Paris-Saclay (ComUE)

URL: http://www.theses.fr/2016SACLO003

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Ce manuscrit décrit des expériences d’optique atomique quantique utilisant un détecteur résolu en impulsions d’atomes uniques d’hélium métastable. La première partie du manuscrit décrit la… (more)

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Ce manuscrit décrit des expériences d’optique atomique quantique utilisant un détecteur résolu en impulsions d’atomes uniques d’hélium métastable. La première partie du manuscrit décrit la mesure de cohérence de deuxième ordre de la superradiance à partir d’un condensat de Bose-Einstein d’helium métastable. Bien que le condensat soit cohérent et le gain du processus de superradiance élevé, celle-ci montre toujours une statistique thermique comme celle de l’émission spontanée. La suite du manuscrit est dédiée au test de la non localité d’une source atomique corrélée en impulsion. Le schéma du test s’inspire d’une réalisation faite par Rarity et Tapster sur des photons intriqués en impulsion. Les ingrédients principaux d’un tel schéma sont la source atomique générée par instabilité dynamique du condensat dans un réseau optique en mouvement, le contrôle cohérent des atomes par diffraction de Bragg et la mesure de la corrélation des atomes dans les différentes voies de sortie du schéma interférométrique. Un point clé est le contrôle et la manipulation de la phase des ondes atomiques. Le chapitre 3 décrit les tests sur le contrôle cohérent par diffraction de Bragg et leurs résultats encourageants. La nature non classique de notre source atomique est démontrée par l’observation d’une interférence à deux particules en les envoyant sur une séparatrice atomique. Cet analogue atomique de l’expérience de Hong Ou et Mandel est le sujet du dernier chapitre de ce manuscrit. Le résultat de cette expérience ouvre la possibilité du test d’inégalité de Bell avec des particules massives corrélées sur des degrés de liberté externe.

This manuscript describes quantum atom optics experiments using metastable helium atoms with a single-atom momentum resolved detector. In the first part of this manuscript, the second order correlation measurement of the superradiance from a metastable helium Bose-Einstein condensate is presented. The superradiance effect is the collective radiation of dense ensemble where a strong gain of the radiation is expected. We have shown the thermal like statistics of the emission even in the presence of the strong gain. The next part of the manuscript is devoted to the quantum nonlocality test using a pair of atoms entangled in momentum. The protocol we came up with is inspired from the one of Rarity and Tapster with pairs of photons entangled in momentum. The essential ingredients of this protocol are the atomic pair produced by dynamical instability of the Bose-Einstein condensate in a moving optical lattice, the coherent control of the atomic pair by Bragg diffraction and the correlation measurement of the atoms in different output modes of the interferometric protocol. The experimental characterization and preparation of coherent control by Bragg diffraction are presented showing the proof of principle of such a protocol. The last part of the manuscript discusses the realization of the atomic Hong-Ou-Mandel experiment using the same atomic pair with an atomic beamsplitter. The non-classical interference…

Advisors/Committee Members: Boiron, Denis (thesis director).

Subjects/Keywords: Condensat de Bose-Einstein; Superradiance; Inégalité de Bell; Indiscernabilité; Intrication; Corrélation; Bose-Einstein condensate; Superradiance; Bell's inequality; Indistinguishability; Entanglement; Correlation; 530.12

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Imanaliev, A. (2016). Towards testing Bell's inequality using atoms correlated in momentum : Vers la réalisation du test d’inégalité de Bell avec les atomes corrèle en impulsion. (Doctoral Dissertation). Université Paris-Saclay (ComUE). Retrieved from http://www.theses.fr/2016SACLO003

Chicago Manual of Style (16^th Edition):

Imanaliev, Almazbek. “Towards testing Bell's inequality using atoms correlated in momentum : Vers la réalisation du test d’inégalité de Bell avec les atomes corrèle en impulsion.” 2016. Doctoral Dissertation, Université Paris-Saclay (ComUE). Accessed April 10, 2021. http://www.theses.fr/2016SACLO003.

MLA Handbook (7^th Edition):

Imanaliev, Almazbek. “Towards testing Bell's inequality using atoms correlated in momentum : Vers la réalisation du test d’inégalité de Bell avec les atomes corrèle en impulsion.” 2016. Web. 10 Apr 2021.

Vancouver:

Imanaliev A. Towards testing Bell's inequality using atoms correlated in momentum : Vers la réalisation du test d’inégalité de Bell avec les atomes corrèle en impulsion. [Internet] [Doctoral dissertation]. Université Paris-Saclay (ComUE); 2016. [cited 2021 Apr 10]. Available from: http://www.theses.fr/2016SACLO003.

Council of Science Editors:

Imanaliev A. Towards testing Bell's inequality using atoms correlated in momentum : Vers la réalisation du test d’inégalité de Bell avec les atomes corrèle en impulsion. [Doctoral Dissertation]. Université Paris-Saclay (ComUE); 2016. Available from: http://www.theses.fr/2016SACLO003

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