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

研究成果: Article

7 引用 (Scopus)

抄録

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.

元の言語English
ページ(範囲)1-9
ページ数9
ジャーナルJournal of Low Temperature Physics
DOI
出版物ステータスAccepted/In press - 2016 3 1

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Excitons
crossovers
Gases
excitons
elementary excitations
Condensation
condensation
gases
occupation
excitation
baths
induction
retarding
formalism
Electrons
LDS 751
electrons

ASJC Scopus subject areas

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

これを引用

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AU - Hanai, R.

AU - Littlewood, P. B.

AU - Ohashi, Yoji

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AB - 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.

KW - BCS–BEC crossover

KW - Electron–hole mixture

KW - Exciton condensate

KW - Non-equilibrium

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