Time-Resolved Speckle Analysis: A New Approach to Coherence and Dephasing of Optical Excitations in Solids

Wolfgang Werner Langbein, Jørn Märcher Hvam, R. Zimmermann

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    Abstract

    A new method to measure the time-dependent coherence of both homogeneously and inhomogeneously broadened optical excitations in solids is presented. The coherence degree of resonantly excited light emission is deduced from the intensity fluctuations over the emission directions (speckles). This method determines the decays of intensity and coherence separately, thus distinguishing lifetime from pure dephasing. The secondary emission of excitons in semiconductor quantum wells is investigated. Here the combination of static disorder and inelastic scattering leads to a partially coherent emission. The temperature dependence is well explained by phonon scattering.
    Original languageEnglish
    JournalPhysical Review Letters
    Volume82
    Issue number5
    Pages (from-to)1040-1043
    ISSN0031-9007
    DOIs
    Publication statusPublished - 1999

    Bibliographical note

    Copyright (1999) by the American Physical Society.

    Keywords

    • RAYLEIGH-SCATTERING
    • QUANTUM-WELLS
    • EXCITONS
    • EMISSION

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