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Article: Propagation of sound and supersonic bright solitons in superfluid fermi gases in BCS-BEC crossover

TitlePropagation of sound and supersonic bright solitons in superfluid fermi gases in BCS-BEC crossover
Authors
KeywordsPhysics
Issue Date2010
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
Citation
Physical Review B - Condensed Matter And Materials Physics, 2010, v. 81 n. 1 How to Cite?
AbstractWe investigate the linear and nonlinear sound propagations in a cigar-shaped superfluid Fermi gas with a large particle number. We first solve analytically the eigenvalue problem of linear collective excitations and provide explicit expressions of all eigenvalues and eigenfunctions, which are valid for all superfluid regimes in the Bardeen-Cooper-Schrieffer-Bose-Einstein condensation (BCS-BEC) crossover. The linear sound speed obtained agrees well with that of a recent experimental measurement. We then consider a weak nonlinear excitation and show that the time evolution of the excitation obeys a Korteweg de Vries equation. Different from the result obtained in quasi-one-dimensional case studied previously, where subsonic dark solitons are obtained via the balance between quantum pressure and nonlinear effect, we demonstrate that bright solitons with supersonic propagating velocity can be generated in the present three-dimensional system through the balance between a waveguidelike dispersion and the interparticle interaction. The supersonic bright solitons obtained display different physical properties in different superfluid regimes and hence can be used to characterize superfluid features of the BCS-BEC crossover. © 2010 The American Physical Society.
Persistent Identifierhttp://hdl.handle.net/10722/125265
ISSN
2014 Impact Factor: 3.736
2015 SCImago Journal Rankings: 1.933
ISI Accession Number ID
Funding AgencyGrant Number
University of Hong Kong
NSF-China10674060
10874043
Key Development Program for Basic Research of China2005CB724508
2006CB921104
ECNU
Funding Information:

The authors are grateful to Danping Yang for his kind help on numerical simulations. G. Huang thanks to the financial support of University of Hong Kong, where part of this work was carried out. This work was supported in part by NSF-China under Grants No. 10674060 and No. 10874043, by the Key Development Program for Basic Research of China under Grants No. 2005CB724508 and No. 2006CB921104, and by the Ph.D. Program Scholarship Fund of ECNU.

References

 

DC FieldValueLanguage
dc.contributor.authorWen, Wen_HK
dc.contributor.authorShen, SQen_HK
dc.contributor.authorHuang, Gen_HK
dc.date.accessioned2010-10-31T11:20:56Z-
dc.date.available2010-10-31T11:20:56Z-
dc.date.issued2010en_HK
dc.identifier.citationPhysical Review B - Condensed Matter And Materials Physics, 2010, v. 81 n. 1en_HK
dc.identifier.issn1098-0121en_HK
dc.identifier.urihttp://hdl.handle.net/10722/125265-
dc.description.abstractWe investigate the linear and nonlinear sound propagations in a cigar-shaped superfluid Fermi gas with a large particle number. We first solve analytically the eigenvalue problem of linear collective excitations and provide explicit expressions of all eigenvalues and eigenfunctions, which are valid for all superfluid regimes in the Bardeen-Cooper-Schrieffer-Bose-Einstein condensation (BCS-BEC) crossover. The linear sound speed obtained agrees well with that of a recent experimental measurement. We then consider a weak nonlinear excitation and show that the time evolution of the excitation obeys a Korteweg de Vries equation. Different from the result obtained in quasi-one-dimensional case studied previously, where subsonic dark solitons are obtained via the balance between quantum pressure and nonlinear effect, we demonstrate that bright solitons with supersonic propagating velocity can be generated in the present three-dimensional system through the balance between a waveguidelike dispersion and the interparticle interaction. The supersonic bright solitons obtained display different physical properties in different superfluid regimes and hence can be used to characterize superfluid features of the BCS-BEC crossover. © 2010 The American Physical Society.en_HK
dc.languageengen_HK
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/en_HK
dc.relation.ispartofPhysical Review B - Condensed Matter and Materials Physicsen_HK
dc.rightsPhysical Review B (Condensed Matter and Materials Physics). Copyright © American Physical Society.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectPhysics-
dc.titlePropagation of sound and supersonic bright solitons in superfluid fermi gases in BCS-BEC crossoveren_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1098-0121&volume=81&issue=1 article no. 014528&spage=&epage=&date=2010&atitle=Propagation+of+sound+and+supersonic+bright+solitons+in+superfluid+Fermi+gases+in+BCS-BEC+crossover-
dc.identifier.emailShen, SQ: sshen@hkucc.hku.hken_HK
dc.identifier.authorityShen, SQ=rp00775en_HK
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevB.81.014528en_HK
dc.identifier.scopuseid_2-s2.0-77954807761en_HK
dc.identifier.hkuros174867en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77954807761&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume81en_HK
dc.identifier.issue1en_HK
dc.identifier.isiWOS:000277958000014-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridWen, W=54937864500en_HK
dc.identifier.scopusauthoridShen, SQ=7403431266en_HK
dc.identifier.scopusauthoridHuang, G=7403424767en_HK

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