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Conference Paper: BCS-BEC crossover in Haldane model
Title | BCS-BEC crossover in Haldane model |
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Authors | |
Issue Date | 2011 |
Publisher | Chineser Physical Society (中國物理學會). |
Citation | Tthe 18th PSHK conference (第十八屆全國半導體物理學術會議), Inner Mongolia, China, 20-23 August 2011 How to Cite? |
Abstract | We theoretically investigate BCS-BEC crossover in spinful Haldane model. We find there are two topologically distinct superfluidity phases which are characterized by chern number C=0 and 2, respectively. At half filling, the region of existing of the topological phase is extremely small. However, when the filling factor deviates from half-filling, the regions of topological phase become quite large. With the increasing of interaction, the topologically trival superfluid phase enters topological phase and then reenter topologically trival superfluid phase. This is because with the interaction increasing, the chemical potential displays non-monotonic behaviors. When the spatial inversion is broken, the paring gaps become different between two sublattices of honeycomb lattice. At the same time, a gapless topological superfluid phase appears. However, the region of topological superfluidity phase became smaller. Lastly, we consider Gaussian fluctuations about mean-field phases. Our results show there are two branch collective modes, one is gapless Anderson-Bogoliubov mode, and the other is gapped Leggett mode. Damping of Leggett mode reaches largest values when one approaches topological phase transition points. |
Persistent Identifier | http://hdl.handle.net/10722/225983 |
DC Field | Value | Language |
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dc.contributor.author | Zhang, Y | - |
dc.contributor.author | Xu, Z | - |
dc.contributor.author | Zhang, S | - |
dc.date.accessioned | 2016-06-06T03:57:12Z | - |
dc.date.available | 2016-06-06T03:57:12Z | - |
dc.date.issued | 2011 | - |
dc.identifier.citation | Tthe 18th PSHK conference (第十八屆全國半導體物理學術會議), Inner Mongolia, China, 20-23 August 2011 | - |
dc.identifier.uri | http://hdl.handle.net/10722/225983 | - |
dc.description.abstract | We theoretically investigate BCS-BEC crossover in spinful Haldane model. We find there are two topologically distinct superfluidity phases which are characterized by chern number C=0 and 2, respectively. At half filling, the region of existing of the topological phase is extremely small. However, when the filling factor deviates from half-filling, the regions of topological phase become quite large. With the increasing of interaction, the topologically trival superfluid phase enters topological phase and then reenter topologically trival superfluid phase. This is because with the interaction increasing, the chemical potential displays non-monotonic behaviors. When the spatial inversion is broken, the paring gaps become different between two sublattices of honeycomb lattice. At the same time, a gapless topological superfluid phase appears. However, the region of topological superfluidity phase became smaller. Lastly, we consider Gaussian fluctuations about mean-field phases. Our results show there are two branch collective modes, one is gapless Anderson-Bogoliubov mode, and the other is gapped Leggett mode. Damping of Leggett mode reaches largest values when one approaches topological phase transition points. | - |
dc.language | eng | - |
dc.publisher | Chineser Physical Society (中國物理學會). | - |
dc.relation.ispartof | Tthe PSHK conference (全國半導體物理學術會議) | - |
dc.title | BCS-BEC crossover in Haldane model | - |
dc.type | Conference_Paper | - |
dc.identifier.email | Zhang, Y: yicaizha@hku.hk | - |
dc.identifier.email | Xu, Z: xuzhihao@hku.hk | - |
dc.identifier.email | Zhang, S: shizhong@hku.hk | - |
dc.identifier.authority | Zhang, S=rp01661 | - |
dc.identifier.hkuros | 246723 | - |
dc.publisher.place | China (中國) | - |