Direct observation of free-exciton thermalization in quantum-well structures

M. Umlauff, J. Hoffmann, H. Kalt, Wolfgang Werner Langbein, Jørn Märcher Hvam, M. Scholl, J. Söllner, M. Heuken, B. Jobst, D. Hommel

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    Abstract

    We report on a direct observation of free-exciton thermalization in quantum-well structures. A narrow energy distribution of free 1s excitons is created in ZnSe-based quantum wells by emission of one LO phonon after optical excitation of the continuum stales with picosecond laser pulses. The subsequent relaxation dynamics within the 1s-exciton dispersion is directly monitored by time-resolved studies of the phonon-assisted photoluminescence. It is demonstrated that the free-exciton distribution remains nonthermal for some 100 ps. The observed dynamics is in reasonable agreement with numerical results of a rate-equation model which accounts for the relevant exciton-phonon coupling mechanisms.
    Original languageEnglish
    JournalPhysical Review B
    Volume57
    Issue number3
    Pages (from-to)1390-1393
    ISSN2469-9950
    DOIs
    Publication statusPublished - 1998

    Bibliographical note

    Copyright (1998) by the American Physical Society.

    Keywords

    • QUASI-2-DIMENSIONAL EXCITONS
    • MOLECULAR-BEAM EPITAXY
    • ENERGY RELAXATION
    • DYNAMICS

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