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Article: Propagation of sound and supersonic bright solitons in superfluid fermi gases in BCS-BEC crossover
Title | Propagation of sound and supersonic bright solitons in superfluid fermi gases in BCS-BEC crossover | ||||||||||
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Authors | |||||||||||
Keywords | Physics | ||||||||||
Issue Date | 2010 | ||||||||||
Publisher | American 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, article no. 014528 How to Cite? | ||||||||||
Abstract | We 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 Identifier | http://hdl.handle.net/10722/125265 | ||||||||||
ISSN | 2014 Impact Factor: 3.736 | ||||||||||
ISI Accession Number ID |
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 Field | Value | Language |
---|---|---|
dc.contributor.author | Wen, W | en_HK |
dc.contributor.author | Shen, SQ | en_HK |
dc.contributor.author | Huang, G | en_HK |
dc.date.accessioned | 2010-10-31T11:20:56Z | - |
dc.date.available | 2010-10-31T11:20:56Z | - |
dc.date.issued | 2010 | en_HK |
dc.identifier.citation | Physical Review B (Condensed Matter and Materials Physics), 2010, v. 81 n. 1, article no. 014528 | - |
dc.identifier.issn | 1098-0121 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/125265 | - |
dc.description.abstract | We 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.language | eng | en_HK |
dc.publisher | American Physical Society. The Journal's web site is located at http://prb.aps.org/ | en_HK |
dc.relation.ispartof | Physical Review B (Condensed Matter and Materials Physics) | - |
dc.rights | Copyright 2010 by The American Physical Society. This article is available online at https://doi.org/10.1103/PhysRevB.81.014528 | - |
dc.subject | Physics | - |
dc.title | Propagation of sound and supersonic bright solitons in superfluid fermi gases in BCS-BEC crossover | en_HK |
dc.type | Article | en_HK |
dc.identifier.openurl | http://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.email | Shen, SQ: sshen@hkucc.hku.hk | en_HK |
dc.identifier.authority | Shen, SQ=rp00775 | en_HK |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1103/PhysRevB.81.014528 | en_HK |
dc.identifier.scopus | eid_2-s2.0-77954807761 | en_HK |
dc.identifier.hkuros | 174867 | en_HK |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-77954807761&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 81 | en_HK |
dc.identifier.issue | 1 | en_HK |
dc.identifier.spage | article no. 014528 | - |
dc.identifier.epage | article no. 014528 | - |
dc.identifier.isi | WOS:000277958000014 | - |
dc.publisher.place | United States | en_HK |
dc.identifier.scopusauthorid | Wen, W=54937864500 | en_HK |
dc.identifier.scopusauthorid | Shen, SQ=7403431266 | en_HK |
dc.identifier.scopusauthorid | Huang, G=7403424767 | en_HK |
dc.identifier.issnl | 1098-0121 | - |