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postgraduate thesis: BEC-BCS crossover in ultra-cold Fermi gases
Title | BEC-BCS crossover in ultra-cold Fermi gases |
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Authors | |
Advisors | |
Issue Date | 2017 |
Publisher | The University of Hong Kong (Pokfulam, Hong Kong) |
Citation | Ding, S. [丁姍姍]. (2017). BEC-BCS crossover in ultra-cold Fermi gases. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. |
Abstract | Ultra-cold atomic gas has attracted intensive interests due to its extreme flexibility. Particularly, the fact that the interaction between atoms can be tuned with Feshbach resonance has stimulated the study of BEC-BCS crossover in two-component Fermi gas. The crossover demonstrates that a two-component Fermi gas will smoothly evolve from a condensate of weakly correlated Cooper pairs to a Bose-Einstein condensation of strongly bound bosonic molecules when increasing the attractive interaction between different components. In this thesis, we study theoretically the superfluid properties of two-component Fermi gases with certain kinds of impurity. With random-phase approximation, the sound velocity, the critical velocity and the dynamic structure factor were calculated for the experimentally achieved mixture of Bose and Fermi superfluid, where the impurity is a Bose-Einstein condensation. Further comments with respect to the results are provided. Moreover, motivated by the realization of spin-orbit coupling with artificial non-Abelian gauge fields, we study aspects of the two-fluid model in the two-dimensional Fermi gas with the effects from both spin-orbit coupling and static impurities. By incorporating the effects of disorder at the level of Gaussian fluctuation, we calculated the paring gap and normal density of the system. Our results can be compared with experiments in the future. |
Degree | Doctor of Philosophy |
Subject | Bose-Einstein condensation Electron gas Fermions Low temperatures |
Dept/Program | Physics |
Persistent Identifier | http://hdl.handle.net/10722/255054 |
DC Field | Value | Language |
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dc.contributor.advisor | Zhang, S | - |
dc.contributor.advisor | Zhang, F | - |
dc.contributor.author | Ding, Shanshan | - |
dc.contributor.author | 丁姍姍 | - |
dc.date.accessioned | 2018-06-21T03:42:04Z | - |
dc.date.available | 2018-06-21T03:42:04Z | - |
dc.date.issued | 2017 | - |
dc.identifier.citation | Ding, S. [丁姍姍]. (2017). BEC-BCS crossover in ultra-cold Fermi gases. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. | - |
dc.identifier.uri | http://hdl.handle.net/10722/255054 | - |
dc.description.abstract | Ultra-cold atomic gas has attracted intensive interests due to its extreme flexibility. Particularly, the fact that the interaction between atoms can be tuned with Feshbach resonance has stimulated the study of BEC-BCS crossover in two-component Fermi gas. The crossover demonstrates that a two-component Fermi gas will smoothly evolve from a condensate of weakly correlated Cooper pairs to a Bose-Einstein condensation of strongly bound bosonic molecules when increasing the attractive interaction between different components. In this thesis, we study theoretically the superfluid properties of two-component Fermi gases with certain kinds of impurity. With random-phase approximation, the sound velocity, the critical velocity and the dynamic structure factor were calculated for the experimentally achieved mixture of Bose and Fermi superfluid, where the impurity is a Bose-Einstein condensation. Further comments with respect to the results are provided. Moreover, motivated by the realization of spin-orbit coupling with artificial non-Abelian gauge fields, we study aspects of the two-fluid model in the two-dimensional Fermi gas with the effects from both spin-orbit coupling and static impurities. By incorporating the effects of disorder at the level of Gaussian fluctuation, we calculated the paring gap and normal density of the system. Our results can be compared with experiments in the future. | - |
dc.language | eng | - |
dc.publisher | The University of Hong Kong (Pokfulam, Hong Kong) | - |
dc.relation.ispartof | HKU Theses Online (HKUTO) | - |
dc.rights | The author retains all proprietary rights, (such as patent rights) and the right to use in future works. | - |
dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. | - |
dc.subject.lcsh | Bose-Einstein condensation | - |
dc.subject.lcsh | Electron gas | - |
dc.subject.lcsh | Fermions | - |
dc.subject.lcsh | Low temperatures | - |
dc.title | BEC-BCS crossover in ultra-cold Fermi gases | - |
dc.type | PG_Thesis | - |
dc.description.thesisname | Doctor of Philosophy | - |
dc.description.thesislevel | Doctoral | - |
dc.description.thesisdiscipline | Physics | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.5353/th_991044014360503414 | - |
dc.date.hkucongregation | 2018 | - |
dc.identifier.mmsid | 991044014360503414 | - |