Long coherence times in self-assembled semiconductor quantum dots

Dan Birkedal, K. Leosson, Jørn Märcher Hvam

    Research output: Contribution to journalJournal articleResearchpeer-review


    We report measurements of ultra-long 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 mueV, 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
    JournalSuperlattices and Microstructures
    Issue number2-4
    Pages (from-to)97-105
    Publication statusPublished - 2002


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