Non-equilibrium Properties of a Pumped-Decaying Bose-Condensed Electron–Hole Gas in the BCS–BEC Crossover Region

R. Hanai, P. B. Littlewood, Yoji Ohashi

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We theoretically investigate a Bose-condensed exciton gas out of equilibrium. Within the framework of the combined BCS-Leggett strong-coupling theory with the non-equilibrium Keldysh formalism, we show how the Bose–Einstein condensation (BEC) of excitons is suppressed to eventually disappear, when the system is in the non-equilibrium steady state. The supply of electrons and holes from the bath is shown to induce quasi-particle excitations, leading to the partial occupation of the upper branch of Bogoliubov single-particle excitation spectrum. We also discuss how this quasi-particle induction is related to the suppression of exciton BEC, as well as the stability of the steady state.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalJournal of Low Temperature Physics
DOIs
Publication statusAccepted/In press - 2016 Mar 1

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Keywords

  • BCS–BEC crossover
  • Electron–hole mixture
  • Exciton condensate
  • Non-equilibrium

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)

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