Instantaneous Rayleigh scattering from excitons localized in monolayer islands

Wolfgang Langbein, Kristjan Leosson, Jacob Riis Jensen, Jørn Märcher Hvam, R. Zimmermann

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    Abstract

    We show that the initial dynamics of Rayleigh scattering from excitons in quantum wells can be either instantaneous or delayed, depending on the exciton ensemble studied. For excitation of the entire exciton resonance, a finite rise time given by the inverse inhomogeneous broadening: of the exciton resonance is observed. Instead, when exciting only a subsystem of the exciton resonance, in our case excitons localized in quantum well regions of a specific monolayer thickness, the rise has an instantaneous component. This is due to the spatial nonuniformity of the initially excited exciton polarization, which emits radiation also into nonspecular directions.
    Original languageEnglish
    JournalPhysical Review B Condensed Matter
    Volume61
    Issue number16
    Pages (from-to)10555-10558
    ISSN0163-1829
    DOIs
    Publication statusPublished - 2000

    Bibliographical note

    Copyright (2000) American Physical Society

    Keywords

    • QUANTUM-WELL STRUCTURES
    • EMISSION

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