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      Excitonic condensation under spin-orbit coupling and BEC-BCS crossover

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      Author
      Hakioǧlu T.
      Şahin, M.
      Date
      2007
      Source Title
      Physical Review Letters
      Print ISSN
      0031-9007
      Publisher
      The American Physical Society
      Volume
      98
      Issue
      16
      Pages
      166405-1 - 166405-4
      Language
      English
      Type
      Article
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      Abstract
      The condensation of electron-hole pairs is studied at zero temperature and in the presence of a weak spin-orbit coupling (SOC) in coupled quantum wells. Under realistic conditions, a perturbative SOC can have observable effects in the order parameter of the condensate. First, the fermion exchange symmetry is absent. As a result, the condensate spin has no definite parity. Additionally, the excitonic SOC breaks the rotational symmetry yielding a complex order parameter in an unconventional way; i.e., the phase pattern of the order parameter is a function of the condensate density. This is manifested through finite off-diagonal components of the static spin susceptibility, suggesting a new experimental method to confirm an excitonic condensate.
      Keywords
      Carrier concentration
      Condensation
      Excitons
      Fermions
      Ion exchange
      Excitonic condensation
      Fermion exchange
      Phase pattern
      Spin orbit coupling (SOC)
      Spin dynamics
      Permalink
      http://hdl.handle.net/11693/23484
      Published Version (Please cite this version)
      http://dx.doi.org/10.1103/PhysRevLett.98.166405
      Collections
      • Department of Physics 2336
      • Nanotechnology Research Center (NANOTAM) 1031
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