Coherent optical nonlinearities and phase relaxation of quasi-three-dimensional and quasi-two-dimensional excitons in ZnSxSe1 - x/ZnSe structures

Hans Peter Wagner, A. Schätz, R. Maier, Wolfgang Werner Langbein, Jørn Märcher Hvam

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    Abstract

    We investigate the dephasing of heavy-hole excitons in different free-standing ZnSxSe1-x/ZnSe layer structures by spectrally resolved transient four-wave mixing. ZnSe layers of 80, 8, and 4 nm thickness with ternary barriers are studied, representing the crossover from quasi-three-dimensional to quasi-two-dimensional excitons. A common feature of the four-wave-mixing signals is the appearance of two components, a prompt signature and a delayed photon echo, which are identified by their different polarization dependencies and decay times. For crosslinear polarized fields, the rapidly decaying signal is attributed to the response of spin-coupled exciton states, with a decay time given by the inhomogeneous broadening. The photon echo is due to a distribution of localized, noninteracting excitons. We determine the exciton-exciton and exciton-phonon scattering cross sections for different dimensionalities by the intensity and temperature dependencies of the exciton dephasing.
    Original languageEnglish
    JournalPhysical Review B
    Volume56
    Issue number19
    Pages (from-to)12581-12588
    ISSN2469-9950
    DOIs
    Publication statusPublished - 1997

    Bibliographical note

    Copyright (1997) by the American Physical Society.

    Keywords

    • SEMICONDUCTORS
    • GAAS
    • PHOTON-ECHOES
    • MULTIPLE-QUANTUM-WELLS
    • SPECTROSCOPY
    • ZNSE
    • POLARIZATION DEPENDENCE
    • LINEWIDTHS
    • 4-WAVE-MIXING SIGNALS
    • DISORDER

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