Logo do repositório
 

Spontaneous symmetry breaking of Bose-Fermi mixtures in double-well potentials

dc.contributor.authorAdhikari, S. K. [UNESP]
dc.contributor.authorMalomed, São Paulo
dc.contributor.authorSalasnich, L.
dc.contributor.authorToigo, F.
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionTel Aviv University
dc.contributor.institutionUniversità di Padova
dc.date.accessioned2022-04-28T21:01:22Z
dc.date.available2022-04-28T21:01:22Z
dc.date.issued2010-05-26
dc.description.abstractWe study the spontaneous symmetry breaking (SSB) of a superfluid Bose-Fermi (BF) mixture in a double-well potential (DWP). The mixture is described by the Gross-Pitaevskii equation (GPE) for the bosons, coupled to an equation for the order parameter of the Fermi superfluid, which is derived from the respective density functional in the unitarity limit (a similar model applies to the BCS regime, too). Straightforward SSB in the degenerate Fermi gas loaded into a DWP is impossible, as it requires an attractive self-interaction, and the intrinsic nonlinearity in the Fermi gas is repulsive. Nonetheless, we demonstrate that the symmetry breaking is possible in the mixture with attraction between fermions and bosons, like K40 and Rb87. Numerical results are represented by dependencies of asymmetry parameters for both components on particle numbers of the mixture, NF and NB, and by phase diagrams in the (NF,NB) plane, which displays regions of symmetric and asymmetric ground states. The dynamical picture of the SSB, induced by a gradual transformation of the single-well potential into the DWP, is reported too. An analytical approximation is proposed for the case when the GPE for the boson wave function may be treated by means of the Thomas-Fermi (TF) approximation. Under a special linear relationship between NF and NB, the TF approximation allows us to reduce the model to a single equation for the fermionic function, which includes competing repulsive and attractive nonlinear terms. The latter one directly displays the mechanism of the generation of the effective attraction in the Fermi superfluid, mediated by the bosonic component of the mixture. © 2010 The American Physical Society.en
dc.description.affiliationInstituto de Física Teórica Universidade Estadual Paulista, 01.140-070 São Paulo, São Paulo
dc.description.affiliationDepartment of Physical Electronics School of Electrical Engineering Tel Aviv University, Tel Aviv 69978
dc.description.affiliationCons. Naz. Delle Ric. and Consorzio Naz. Interuniversitario per le Scienze Fisiche della Materia Unità di Padova Università di Padova, Via Marzolo 8, I-35131 Padova
dc.description.affiliationUnespInstituto de Física Teórica Universidade Estadual Paulista, 01.140-070 São Paulo, São Paulo
dc.identifierhttp://dx.doi.org/10.1103/PhysRevA.81.053630
dc.identifier.citationPhysical Review A - Atomic, Molecular, and Optical Physics, v. 81, n. 5, 2010.
dc.identifier.doi10.1103/PhysRevA.81.053630
dc.identifier.issn1050-2947
dc.identifier.issn1094-1622
dc.identifier.scopus2-s2.0-77953210725
dc.identifier.urihttp://hdl.handle.net/11449/225866
dc.language.isoeng
dc.relation.ispartofPhysical Review A - Atomic, Molecular, and Optical Physics
dc.sourceScopus
dc.titleSpontaneous symmetry breaking of Bose-Fermi mixtures in double-well potentialsen
dc.typeArtigo
dspace.entity.typePublication
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Física Teórica (IFT), São Paulopt

Arquivos