Nonlinear Response of Localized Excitons: Effects of the Excitation-Induced Dephasing

Paola Borri, Wolfgang Werner Langbein, Dan Birkedal, V. G. Lyssenko, Jørn Marcher Hvam

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The polarization dependence of the ultrafast nonlinear response of localized excitons in GaAs/AlGaAs quantum wells has been investigated by spectrally resolved, transient four-wave mixing. The role of the excitation-induced dephasing in the delay dependence of the signal is discussed in detail. In particular, we show experimentally that the excitation-induced dephasing gives rise to a photon echo in inhomogeneous systems. We develop a simple analytical model for the delay dependence of the signal, which enables us to deduce the dephasing time from the four-wave mixing decay.
    Original languageEnglish
    JournalPHYSICA STATUS SOLIDI A-APPLIED RESEARCH
    Volume164
    Issue number1
    Pages (from-to)61-65
    ISSN0031-8965
    DOIs
    Publication statusPublished - 1997

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