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Article: BCS-BEC crossover induced by a synthetic non-Abelian gauge field

TitleBCS-BEC crossover induced by a synthetic non-Abelian gauge field
Authors
Issue Date2011
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
Citation
Physical Review B - Condensed Matter And Materials Physics, 2011, v. 84 n. 1 How to Cite?
AbstractWe investigate the ground state of interacting spin-12 fermions in three dimensions at a finite density (ρ∼kF3) in the presence of a uniform non-Abelian gauge field. The gauge-field configuration (GFC) described by a vector λ?(λx,λy,λz) , whose magnitude λ determines the gauge coupling strength, generates a generalized Rashba spin-orbit interaction. For a weak attractive interaction in the singlet channel described by a small negative scattering length (k F|as|?1), the ground state in the absence of the gauge field (λ=0) is a BCS (Bardeen-Cooper-Schrieffer) superfluid with large overlapping pairs. With increasing gauge-coupling strength, a non-Abelian gauge field engenders a crossover of this BCS ground state to a BEC (Bose-Einstein condensate) of bosons even with a weak attractive interaction that fails to produce a two-body bound state in free vacuum (λ=0). For large gauge couplings (λ/kF?1), the BEC attained is a condensate of bosons whose properties are solely determined by the Rashba gauge field (and not by the scattering length so long as it is nonzero)-we call these bosons "rashbons." In the absence of interactions (as=0 -), the shape of the Fermi surface of the system undergoes a topological transition at a critical gauge coupling λT. For high-symmetry GFCs we show that the crossover from the BCS superfluid to the rashbon BEC occurs in the regime of λ near λT. In the context of cold atomic systems, these results make an interesting suggestion of obtaining BCS-BEC crossover through a route other than tuning the interaction between the fermions. © 2011 American Physical Society.
Persistent Identifierhttp://hdl.handle.net/10722/167079
ISSN
2014 Impact Factor: 3.736
2015 SCImago Journal Rankings: 1.933
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorVyasanakere, JPen_US
dc.contributor.authorZhang, Sen_US
dc.contributor.authorShenoy, VBen_US
dc.date.accessioned2012-09-28T04:02:57Z-
dc.date.available2012-09-28T04:02:57Z-
dc.date.issued2011en_US
dc.identifier.citationPhysical Review B - Condensed Matter And Materials Physics, 2011, v. 84 n. 1en_US
dc.identifier.issn1098-0121en_US
dc.identifier.urihttp://hdl.handle.net/10722/167079-
dc.description.abstractWe investigate the ground state of interacting spin-12 fermions in three dimensions at a finite density (ρ∼kF3) in the presence of a uniform non-Abelian gauge field. The gauge-field configuration (GFC) described by a vector λ?(λx,λy,λz) , whose magnitude λ determines the gauge coupling strength, generates a generalized Rashba spin-orbit interaction. For a weak attractive interaction in the singlet channel described by a small negative scattering length (k F|as|?1), the ground state in the absence of the gauge field (λ=0) is a BCS (Bardeen-Cooper-Schrieffer) superfluid with large overlapping pairs. With increasing gauge-coupling strength, a non-Abelian gauge field engenders a crossover of this BCS ground state to a BEC (Bose-Einstein condensate) of bosons even with a weak attractive interaction that fails to produce a two-body bound state in free vacuum (λ=0). For large gauge couplings (λ/kF?1), the BEC attained is a condensate of bosons whose properties are solely determined by the Rashba gauge field (and not by the scattering length so long as it is nonzero)-we call these bosons "rashbons." In the absence of interactions (as=0 -), the shape of the Fermi surface of the system undergoes a topological transition at a critical gauge coupling λT. For high-symmetry GFCs we show that the crossover from the BCS superfluid to the rashbon BEC occurs in the regime of λ near λT. In the context of cold atomic systems, these results make an interesting suggestion of obtaining BCS-BEC crossover through a route other than tuning the interaction between the fermions. © 2011 American Physical Society.en_US
dc.languageengen_US
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/en_US
dc.relation.ispartofPhysical Review B - Condensed Matter and Materials Physicsen_US
dc.titleBCS-BEC crossover induced by a synthetic non-Abelian gauge fielden_US
dc.typeArticleen_US
dc.identifier.emailZhang, S: shizhong@hku.hken_US
dc.identifier.authorityZhang, S=rp01661en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1103/PhysRevB.84.014512en_US
dc.identifier.scopuseid_2-s2.0-79961244630en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79961244630&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume84en_US
dc.identifier.issue1en_US
dc.identifier.isiWOS:000293127600007-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridVyasanakere, JP=45561801200en_US
dc.identifier.scopusauthoridZhang, S=46161829300en_US
dc.identifier.scopusauthoridShenoy, VB=35512522300en_US

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