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Article: Imbalanced superfluid state in an annular disk

TitleImbalanced superfluid state in an annular disk
Authors
Issue Date2009
PublisherInstitute of Physics Publishing. The Journal's web site is located at http://www.iop.org/Journals/jpcm
Citation
Journal Of Physics Condensed Matter, 2009, v. 21 n. 35, article no. 355701 How to Cite?
AbstractThe imbalanced superfluid state of spin- 1/2 fermions with s-wave pairing is numerically studied by solving the Bogoliubov-de Gennes equation at zero temperature in an annular disk geometry with narrow radial width. Two distinct types of systems are considered. The first case may be relevant to heavy fermion superconductors, where magnetic field causes spin imbalance via Zeeman interaction and the system is studied in a grand canonical ensemble. As the magnetic field increases, the system is transformed from the uniform superfluid state to the Fulde-Ferrell-Larkin-Ovchinnikov state, and finally to the spin polarized normal state. The second case may be relevant to cold fermionic systems, where the number of fermions of each species is fixed as in a canonical ensemble. In this case, the ground state depends on the pairing strength. For weak pairing, the order parameter exhibits a periodic domain wall lattice pattern with a localized spin distribution at low spin imbalance, and a sinusoidally modulated pattern with extended spin distribution at high spin imbalance. For strong pairing, the phase separation between the superfluid state and polarized normal state is found to be preferable, while the increase of spin imbalance simply changes the ratio between them. © 2009 IOP Publishing Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/175167
ISSN
2015 Impact Factor: 2.209
2015 SCImago Journal Rankings: 0.812
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorYe, Fen_US
dc.contributor.authorChen, Yen_US
dc.contributor.authorWang, ZDen_US
dc.contributor.authorZhang, FCen_US
dc.date.accessioned2012-11-26T08:49:31Z-
dc.date.available2012-11-26T08:49:31Z-
dc.date.issued2009en_US
dc.identifier.citationJournal Of Physics Condensed Matter, 2009, v. 21 n. 35, article no. 355701en_US
dc.identifier.issn0953-8984en_US
dc.identifier.urihttp://hdl.handle.net/10722/175167-
dc.description.abstractThe imbalanced superfluid state of spin- 1/2 fermions with s-wave pairing is numerically studied by solving the Bogoliubov-de Gennes equation at zero temperature in an annular disk geometry with narrow radial width. Two distinct types of systems are considered. The first case may be relevant to heavy fermion superconductors, where magnetic field causes spin imbalance via Zeeman interaction and the system is studied in a grand canonical ensemble. As the magnetic field increases, the system is transformed from the uniform superfluid state to the Fulde-Ferrell-Larkin-Ovchinnikov state, and finally to the spin polarized normal state. The second case may be relevant to cold fermionic systems, where the number of fermions of each species is fixed as in a canonical ensemble. In this case, the ground state depends on the pairing strength. For weak pairing, the order parameter exhibits a periodic domain wall lattice pattern with a localized spin distribution at low spin imbalance, and a sinusoidally modulated pattern with extended spin distribution at high spin imbalance. For strong pairing, the phase separation between the superfluid state and polarized normal state is found to be preferable, while the increase of spin imbalance simply changes the ratio between them. © 2009 IOP Publishing Ltd.en_US
dc.languageengen_US
dc.publisherInstitute of Physics Publishing. The Journal's web site is located at http://www.iop.org/Journals/jpcmen_US
dc.relation.ispartofJournal of Physics Condensed Matteren_US
dc.titleImbalanced superfluid state in an annular disken_US
dc.typeArticleen_US
dc.identifier.emailWang, ZD: zwang@hkucc.hku.hken_US
dc.identifier.emailZhang, FC: fuchun@hkucc.hku.hken_US
dc.identifier.authorityWang, ZD=rp00802en_US
dc.identifier.authorityZhang, FC=rp00840en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1088/0953-8984/21/35/355701en_US
dc.identifier.pmid21828640-
dc.identifier.scopuseid_2-s2.0-72049100134en_US
dc.identifier.hkuros166031-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-72049100134&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume21en_US
dc.identifier.issue35en_US
dc.identifier.isiWOS:000268867100021-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridYe, F=36792088600en_US
dc.identifier.scopusauthoridChen, Y=7601428042en_US
dc.identifier.scopusauthoridWang, ZD=14828459100en_US
dc.identifier.scopusauthoridZhang, FC=14012468800en_US

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