Pairing of Fermions with Unequal Effective Charges in an Artificial Magnetic Field

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dc.citation.epage045305-5en_US
dc.citation.issueNumber16en_US
dc.citation.spage045305-1en_US
dc.citation.volumeNumber116en_US
dc.contributor.authorÜnal, F. N.en_US
dc.contributor.authorOktel, M. Ö.en_US
dc.date.accessioned2018-04-12T10:43:30Z
dc.date.available2018-04-12T10:43:30Z
dc.date.issued2016en_US
dc.departmentDepartment of Physicsen_US
dc.description.abstractArtificial magnetic fields (AMFs) created for ultracold systems depend sensitively on the internal structure of the atoms. In a mixture, each component experiences a different AMF depending on its internal state. This enables the study of Bardeen-Cooper-Schrieffer pairing of fermions with unequal effective charges. In this Letter, we investigate the superconducting (SC) transition of a system formed by such pairs as a function of field strength. We consider a homogeneous two-component Fermi gas of unequal effective charges but equal densities with attractive interactions. We find that the phase diagram is altered drastically compared to the usual balanced charge case. First, for some AMFs there is no SC transition and isolated SC phases are formed, reflecting the discrete Landau level (LL) structure. SC phases become reentrant both in AMF and temperature. For extremely high fields where both components are confined to their lowest LLs, the effect of the charge imbalance is suppressed. Charge asymmetry reduces the critical temperature even in the low-field semiclassical regime. We discuss a pair breaking mechanism due to the unequal Lorentz forces acting on the components of the Cooper pairs to identify the underlying physics.en_US
dc.description.provenanceMade available in DSpace on 2018-04-12T10:43:30Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 179475 bytes, checksum: ea0bedeb05ac9ccfb983c327e155f0c2 (MD5) Previous issue date: 2016en
dc.identifier.doi10.1103/PhysRevLett.116.045305en_US
dc.identifier.issn0031-9007
dc.identifier.urihttp://hdl.handle.net/11693/36535
dc.language.isoEnglishen_US
dc.publisherAmerican Physical Societyen_US
dc.relation.isversionofhttp://dx.doi.org/10.1103/PhysRevLett.116.045305en_US
dc.source.titlePhysical Review Lettersen_US
dc.subjectElectron gasen_US
dc.subjectMagnetic fieldsen_US
dc.subjectAttractive interactionsen_US
dc.subjectBardeen-Cooper-Schriefferen_US
dc.subjectCharge asymmetriesen_US
dc.subjectCharge imbalanceen_US
dc.subjectCritical temperaturesen_US
dc.subjectInternal structureen_US
dc.subjectPair-breaking mechanismen_US
dc.subjectTwo-component fermi gasen_US
dc.subjectFermionsen_US
dc.titlePairing of Fermions with Unequal Effective Charges in an Artificial Magnetic Fielden_US
dc.typeArticleen_US

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