Long lived coherence in self-assembled quantum dots

Dan Birkedal, Kristjan Leosson, Jørn Märcher Hvam

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    Abstract

    We report measurements of ultralong coherence in self-assembled quantum dots. Transient four-wave mixing experiments at 5 K show an average dephasing time of 372 ps, corresponding to a homogeneous linewidth of 3.5 mu eV, which is significantly smaller than the linewidth observed in single-dot luminescence. Time-resolved luminescence measurements show a lifetime of the dot ground state of 800 ps, demonstrating the presence of pure dephasing at finite temperature. The homogeneous width is lifetime limited only at temperatures approaching 0 K.
    Original languageEnglish
    JournalPhysical Review Letters
    Volume87
    Issue number22
    Pages (from-to)227401
    ISSN0031-9007
    DOIs
    Publication statusPublished - 2001

    Bibliographical note

    Copyright (2001) American Physical Society

    Keywords

    • SPECTROSCOPY
    • WELLS
    • COMPUTATION
    • PHONON INTERACTIONS
    • SPECTRAL DIFFUSION
    • MICROSCOPIC PHOTOLUMINESCENCE
    • TEMPERATURE

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