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      Radiative Dark-Bright Instability and Critical Casimir Effect in DQW Exciton Condensates

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      Author(s)
      Hakioglu, T.
      Özgün E.
      Date
      2011
      Source Title
      Solid State Communications
      Print ISSN
      0038-1098
      Publisher
      Elsevier
      Volume
      151
      Issue
      14-15
      Pages
      1045 - 1048
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      It is already well known that radiative interband interaction in the excitonic normal liquid in semiconducting double quantum wells is responsible for a negligible splitting between the energies of the dark and bright excitons enabling us to consider a four fold spin degeneracy. This has also lead many workers to naively consider the same degeneracy in studying the condensate. On the other hand, the non-perturbative aspects of this interaction in the condensed phase, e.g. its consequences on the order parameter and the dark-bright mixture in the ground state have not been explored. In this work, we demonstrate that the ground state concentrations of the dark and the bright exciton condensates are dramatically different beyond a sharp interband coupling threshold where the contribution of the bright component in the ground state vanishes. This shows that the effect of the radiative interband interaction on the condensate is nonperturbative. We also observe in the free energy a discontinuous derivative with respect to the layer separation at the entrance to the condensed phase, indicating a strong critical Casimir force. An estimate of its strength shows that it is measurable. Measuring the Casimir force is challenging, but at the same time it has a conclusive power about the presence of the long sought for condensed phase.
      Keywords
      Semiconductor
      Quantum well
      Radiation effects
      Electron-electron interaction
      Permalink
      http://hdl.handle.net/11693/13399
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.ssc.2011.04.015
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