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

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

Research output: Contribution to journalArticlepeer-review

16 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)127-135
Number of pages9
JournalJournal of Low Temperature Physics
Volume183
Issue number3-4
DOIs
Publication statusPublished - 2016 May 1

Keywords

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

ASJC Scopus subject areas

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

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