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

Journal Article · Tue Mar 01 04:00:00 EST 2016 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/s10909-016-1552-6· OSTI ID:1357161

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

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.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1357161
• Journal Information: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 3-4 Vol. 183; ISSN 0022-2291
• Publisher: Plenum Press
• Country of Publication: United States
• Language: English

Related Subjects

BCS-BEC crossover
electron-hole mixture
exciton condensate
non-equilibrium