Radiative dark-bright instability and the critical Casimir effect in DQW exciton condensates


Creative Commons License

Hakioglu T., Ozgun E.

SOLID STATE COMMUNICATIONS, cilt.151, ss.1045-1048, 2011 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 151
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1016/j.ssc.2011.04.015
  • Dergi Adı: SOLID STATE COMMUNICATIONS
  • Sayfa Sayıları: ss.1045-1048

Özet

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.