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

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      Author(s)
      Ünal, F. N.
      Oktel, M. Ö.
      Date
      2016
      Source Title
      Physical Review Letters
      Print ISSN
      0031-9007
      Publisher
      American Physical Society
      Volume
      116
      Issue
      16
      Pages
      045305-1 - 045305-5
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      Artificial 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.
      Keywords
      Electron gas
      Magnetic fields
      Attractive interactions
      Bardeen-Cooper-Schrieffer
      Charge asymmetries
      Charge imbalance
      Critical temperatures
      Internal structure
      Pair-breaking mechanism
      Two-component fermi gas
      Fermions
      Permalink
      http://hdl.handle.net/11693/36535
      Published Version (Please cite this version)
      http://dx.doi.org/10.1103/PhysRevLett.116.045305
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