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Article: Superfluid density of a spin-orbit-coupled Bose gas

TitleSuperfluid density of a spin-orbit-coupled Bose gas
Authors
Issue Date2016
PublisherAmerican 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?
AbstractWe 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 Identifierhttp://hdl.handle.net/10722/234774
ISSN
2017 Impact Factor: 2.909
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZhang, Y-
dc.contributor.authorYu, Z-
dc.contributor.authorNg, T-
dc.contributor.authorZhang, S-
dc.contributor.authorPitaevskii, L-
dc.contributor.authorStringari, S-
dc.date.accessioned2016-10-14T13:49:10Z-
dc.date.available2016-10-14T13:49:10Z-
dc.date.issued2016-
dc.identifier.citationPhysical Review A: covering atomic, molecular, and optical physics and quantum information, 2016, v. 94 n. 3, article no. 033635 , p. 1-5-
dc.identifier.issn2469-9926-
dc.identifier.urihttp://hdl.handle.net/10722/234774-
dc.description.abstractWe 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.languageeng-
dc.publisherAmerican Physical Society. The Journal's web site is located at http://journals.aps.org/pra/-
dc.relation.ispartofPhysical Review A: covering atomic, molecular, and optical physics and quantum information-
dc.rightsCopyright 2016 by The American Physical Society. This article is available online at https://doi.org/10.1103/PhysRevA.94.033635-
dc.titleSuperfluid density of a spin-orbit-coupled Bose gas-
dc.typeArticle-
dc.identifier.emailZhang, Y: yicaizha@hku.hk-
dc.identifier.emailZhang, S: shizhong@hku.hk-
dc.identifier.authorityZhang, S=rp01661-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevA.94.033635-
dc.identifier.scopuseid_2-s2.0-84991710630-
dc.identifier.hkuros269981-
dc.identifier.volume94-
dc.identifier.issue3-
dc.identifier.spagearticle no. 033635, p. 1-
dc.identifier.epagearticle no. 033635, p. 5-
dc.identifier.isiWOS:000384374500008-
dc.publisher.placeUnited States-

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