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Article: BCS-BEC crossover induced by a synthetic non-Abelian gauge field
Title | BCS-BEC crossover induced by a synthetic non-Abelian gauge field |
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Authors | |
Issue Date | 2011 |
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), 2011, v. 84 n. 1, article no. 014512 How to Cite? |
Abstract | We 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 Identifier | http://hdl.handle.net/10722/167079 |
ISSN | 2014 Impact Factor: 3.736 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
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dc.contributor.author | Vyasanakere, JP | en_US |
dc.contributor.author | Zhang, S | en_US |
dc.contributor.author | Shenoy, VB | en_US |
dc.date.accessioned | 2012-09-28T04:02:57Z | - |
dc.date.available | 2012-09-28T04:02:57Z | - |
dc.date.issued | 2011 | en_US |
dc.identifier.citation | Physical Review B (Condensed Matter and Materials Physics), 2011, v. 84 n. 1, article no. 014512 | - |
dc.identifier.issn | 1098-0121 | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/167079 | - |
dc.description.abstract | We 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.language | eng | en_US |
dc.publisher | American Physical Society. The Journal's web site is located at http://prb.aps.org/ | en_US |
dc.relation.ispartof | Physical Review B (Condensed Matter and Materials Physics) | - |
dc.title | BCS-BEC crossover induced by a synthetic non-Abelian gauge field | en_US |
dc.type | Article | en_US |
dc.identifier.email | Zhang, S: shizhong@hku.hk | en_US |
dc.identifier.authority | Zhang, S=rp01661 | en_US |
dc.description.nature | link_to_subscribed_fulltext | en_US |
dc.identifier.doi | 10.1103/PhysRevB.84.014512 | en_US |
dc.identifier.scopus | eid_2-s2.0-79961244630 | en_US |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-79961244630&selection=ref&src=s&origin=recordpage | en_US |
dc.identifier.volume | 84 | en_US |
dc.identifier.issue | 1 | en_US |
dc.identifier.spage | article no. 014512 | - |
dc.identifier.epage | article no. 014512 | - |
dc.identifier.isi | WOS:000293127600007 | - |
dc.publisher.place | United States | en_US |
dc.identifier.scopusauthorid | Vyasanakere, JP=45561801200 | en_US |
dc.identifier.scopusauthorid | Zhang, S=46161829300 | en_US |
dc.identifier.scopusauthorid | Shenoy, VB=35512522300 | en_US |
dc.identifier.issnl | 1098-0121 | - |