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Article: Superfluid density of a spin-orbit-coupled Bose gas
Title | Superfluid density of a spin-orbit-coupled Bose gas |
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Authors | |
Issue Date | 2016 |
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, 2016, v. 94 n. 3, article no. 033635 , p. 1-5 How to Cite? |
Abstract | We discuss the superfluid properties of a uniform, weakly interacting Bose-Einstein condensed gas with spin-orbit coupling, realized recently in experiments. We find a finite normal fluid density ρ n at zero temperature which turns out to be a function of the Raman coupling. In particular, the entire fluid becomes normal at the transition point from the zero momentum to the plane wave phase, even though the condensate fraction remains finite. We emphasize the crucial role played by the breaking of Galilean invariance and by the gapped branch of the elementary excitations whose contribution to various sum rules is discussed explicitly. Our predictions for the superfluid density are successfully compared with the available experimental results based on the measurement of the sound velocities. |
Persistent Identifier | http://hdl.handle.net/10722/234774 |
ISSN | 2023 Impact Factor: 2.6 2023 SCImago Journal Rankings: 1.081 |
ISI Accession Number ID | |
Grants |
DC Field | Value | Language |
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dc.contributor.author | Zhang, Y | - |
dc.contributor.author | Yu, Z | - |
dc.contributor.author | Ng, T | - |
dc.contributor.author | Zhang, S | - |
dc.contributor.author | Pitaevskii, L | - |
dc.contributor.author | Stringari, S | - |
dc.date.accessioned | 2016-10-14T13:49:10Z | - |
dc.date.available | 2016-10-14T13:49:10Z | - |
dc.date.issued | 2016 | - |
dc.identifier.citation | Physical Review A: covering atomic, molecular, and optical physics and quantum information, 2016, v. 94 n. 3, article no. 033635 , p. 1-5 | - |
dc.identifier.issn | 2469-9926 | - |
dc.identifier.uri | http://hdl.handle.net/10722/234774 | - |
dc.description.abstract | We discuss the superfluid properties of a uniform, weakly interacting Bose-Einstein condensed gas with spin-orbit coupling, realized recently in experiments. We find a finite normal fluid density ρ n at zero temperature which turns out to be a function of the Raman coupling. In particular, the entire fluid becomes normal at the transition point from the zero momentum to the plane wave phase, even though the condensate fraction remains finite. We emphasize the crucial role played by the breaking of Galilean invariance and by the gapped branch of the elementary excitations whose contribution to various sum rules is discussed explicitly. Our predictions for the superfluid density are successfully compared with the available experimental results based on the measurement of the sound velocities. | - |
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 2016 by The American Physical Society. This article is available online at https://doi.org/10.1103/PhysRevA.94.033635 | - |
dc.title | Superfluid density of a spin-orbit-coupled Bose gas | - |
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.94.033635 | - |
dc.identifier.scopus | eid_2-s2.0-84991710630 | - |
dc.identifier.hkuros | 269981 | - |
dc.identifier.volume | 94 | - |
dc.identifier.issue | 3 | - |
dc.identifier.spage | article no. 033635, p. 1 | - |
dc.identifier.epage | article no. 033635, p. 5 | - |
dc.identifier.isi | WOS:000384374500008 | - |
dc.publisher.place | United States | - |
dc.relation.project | Superfluid Properties of a Spin-orbit Coupled Bose Gas: Finite Temperature Effects and Hydrodynamic Theory | - |
dc.identifier.issnl | 2469-9926 | - |