Coherent spin dynamics of an interwell excitonic gas in GaAs/AlGaAs coupled quantum wells

A. V. Larionov, V. E. Bisti, M. Bayer, Jørn Märcher Hvam, K. Sørensen

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    Abstract

    The spin dynamics of an interwell exciton gas has been investigated in n-i-n GaAs/AlGaAs coupled quantum wells. The time evolution kinetics of the interwell exciton photoluminescence has been measured under resonant excitation of the 1s heavy-hole intrawell exciton, using a pulsed tunable laser. The formation of a collective exciton phase in time and the temperature dependence of its spin relaxation rate have been studied. The spin relaxation rate of the interwell excitons is strongly reduced in the collective phase. This observation provides evidence for the coherence of the interwell exciton collective phase at temperatures below a critical Tc. A theoretical analysis of the interwell exciton spin-flip dynamics has been developed.
    Original languageEnglish
    JournalPhysical Review B Condensed Matter
    Volume73
    Issue number23
    Pages (from-to)235329
    ISSN0163-1829
    DOIs
    Publication statusPublished - 2006

    Bibliographical note

    Copyright 2006 American Physical Society

    Keywords

    • BOSE-CONDENSATION
    • EXCITATION

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