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Article: Topological superfluids and the BEC-BCS crossover in the attractive Haldane-Hubbard model
Title | Topological superfluids and the BEC-BCS crossover in the attractive Haldane-Hubbard model |
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Authors | |
Issue Date | 2017 |
Publisher | American Physical Society. The Journal's web site is located at http://journals.aps.org/pra/ |
Citation | Physical Review A: covering atomic, molecular, and optical physics and quantum information, 2017, v. 95 n. 4, article no. 043640 , p. 1-9 How to Cite? |
Abstract | Motivated by the recent realization of the Haldane model in a shaking optical lattice, we investigate the effects of attractive interaction and the BEC-BCS crossover in this model at and away from half-filling. We show that, contrary to the usual s-wave BEC-BCS crossover in the lattice, a topological superfluid with Chern number C=2 appears in an extended region of the phase space for intermediate strength of the attractive interaction on the interaction-density plane. When inversion symmetry is broken, a gapless weak topological state is realized. We also investigate the fluctuations in these superfluid phases and show that the Anderson-Bogoliubov mode is quadratic due to time-reversal symmetry breaking and the existence of an undamped Leggett mode in the strong-coupling limit. Near the topological phase transition, the damping of the Leggett mode reaches its maximum. |
Persistent Identifier | http://hdl.handle.net/10722/240950 |
ISSN | 2023 Impact Factor: 2.6 2023 SCImago Journal Rankings: 1.081 |
ISI Accession Number ID |
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 | 2017-05-22T09:20:00Z | - |
dc.date.available | 2017-05-22T09:20:00Z | - |
dc.date.issued | 2017 | - |
dc.identifier.citation | Physical Review A: covering atomic, molecular, and optical physics and quantum information, 2017, v. 95 n. 4, article no. 043640 , p. 1-9 | - |
dc.identifier.issn | 2469-9926 | - |
dc.identifier.uri | http://hdl.handle.net/10722/240950 | - |
dc.description.abstract | Motivated by the recent realization of the Haldane model in a shaking optical lattice, we investigate the effects of attractive interaction and the BEC-BCS crossover in this model at and away from half-filling. We show that, contrary to the usual s-wave BEC-BCS crossover in the lattice, a topological superfluid with Chern number C=2 appears in an extended region of the phase space for intermediate strength of the attractive interaction on the interaction-density plane. When inversion symmetry is broken, a gapless weak topological state is realized. We also investigate the fluctuations in these superfluid phases and show that the Anderson-Bogoliubov mode is quadratic due to time-reversal symmetry breaking and the existence of an undamped Leggett mode in the strong-coupling limit. Near the topological phase transition, the damping of the Leggett mode reaches its maximum. | - |
dc.language | eng | - |
dc.publisher | American Physical Society. The Journal's web site is located at http://journals.aps.org/pra/ | - |
dc.relation.ispartof | Physical Review A: covering atomic, molecular, and optical physics and quantum information | - |
dc.rights | Copyright 2017 by The American Physical Society. This article is available online at https://doi.org/10.1103/PhysRevA.95.043640 | - |
dc.title | Topological superfluids and the BEC-BCS crossover in the attractive Haldane-Hubbard model | - |
dc.type | Article | - |
dc.identifier.email | Zhang, Y: yicaizha@hku.hk | - |
dc.identifier.email | Zhang, S: shizhong@hku.hk | - |
dc.identifier.authority | Zhang, S=rp01661 | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1103/PhysRevA.95.043640 | - |
dc.identifier.scopus | eid_2-s2.0-85018350260 | - |
dc.identifier.hkuros | 272180 | - |
dc.identifier.volume | 95 | - |
dc.identifier.issue | 4 | - |
dc.identifier.spage | article no. 043640, p. 1 | - |
dc.identifier.epage | article no. 043640, p. 9 | - |
dc.identifier.isi | WOS:000400252400005 | - |
dc.publisher.place | United States | - |
dc.identifier.issnl | 2469-9926 | - |