Exciton formation assisted by LO phonons in quantum wells

In-Keun Oh, Jai Singh, Thilagam Lohe, AS Vengurlekar

    Research output: Contribution to journalComment/debate

    30 Citations (Scopus)

    Abstract

    Kinetics of exciton formation involving LO phonons is investigated in quantum wells. Considering the formation of an exciton from a free excited electron-hole pair due to LO-phonon emission, an expression is derived for the rate of formation of an exciton as a function of carrier densities, temperature, and wave vector K‖ of the center of mass of excitons in quantum wells, and the formation time of an exciton is also calculated. The theory is applied to GaAs quantum wells, in which it is found that the exciton formation dominantly occurs at K‖≠0.
    Original languageEnglish
    Pages (from-to)2045-2050
    Number of pages6
    JournalPhysical Review B (Condensed Matter and Materials Physics)
    Volume62
    Issue number3
    DOIs
    Publication statusPublished - 2000

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