Interaction and dephasing of center-of-mass quantized excitons in wide ZnSe/Zn0.94Mg0.06Se quantum wells

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

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    Abstract

    We investigate the interaction and dephasing of the excitons in wide ZnSe/Zn0.94Mg0.06Se quantum wells by spectrally resolved, femtosecond four-wave mixing (FWM). Polarization-dependent measurements indicate that excitation-induced dephasing is the dominant FWM process. The biexcitons of the center-of-mass quantized heavy and light hole excitons are observed, showing binding energies of 3.5 meV. We determine the exciton scattering cross sections with incoherent and coherent excitons. The coherent cross section is found to be larger than the incoherent cross section, which is attributed to a stronger Pauli repulsion for coherent excitons. The exciton interaction rates with acoustic and optical phonons are deduced by their temperature dependencies. The acoustic-phonon scattering is found to be strongly reduced in the investigated wide wells due to the reduced accessible phonon wave vector.
    Original languageEnglish
    JournalPhysical Review B
    Volume57
    Issue number3
    Pages (from-to)1791-1796
    ISSN2469-9950
    DOIs
    Publication statusPublished - 1998

    Bibliographical note

    Copyright (1998) by the American Physical Society.

    Keywords

    • RELAXATION
    • SEMICONDUCTORS
    • EXCITATION
    • ZNSE
    • COHERENT OPTICAL-RESPONSE
    • POLARIZATION DEPENDENCE
    • 4-WAVE-MIXING SIGNALS
    • BEATS
    • RESONANCE

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