Coherent dynamics of interwell excitons in GaAs/AlxGa1-xAs superlattices

V. Mizeikis, Dan Birkedal, Wolfgang Werner Langbein, Jørn Märcher Hvam

    Research output: Contribution to journalJournal articleResearchpeer-review

    232 Downloads (Pure)

    Abstract

    Coherent exciton dynamics in a GaAs/AlxGa1-xAs narrow-miniband superlattice is studied by spectrally resolved transient four-wave mixing. Coherent optical properties of the investigated structure are found to be strongly affected by the existence of two different heavy-hole excitonic states. One of them, the Is heavy-hole exciton, is almost identical to the same state in noninteracting quantum wells, while the other, the heavy-hole interwell exciton, is composed of an electron and a heavy hole in adjacent wells. The interwell exciton leads to a resonant enhancement in the four-wave mixing spectra and exhibits quantum beats with the Is heavy-hole exciton. The dephasing of the interwell exciton is one order of magnitude faster than that of the heavy-hole exciton and is mostly due to intensity-independent scattering mechanisms.
    Original languageEnglish
    JournalPhysical Review B
    Volume55
    Issue number12
    Pages (from-to)7743-7748
    ISSN2469-9950
    DOIs
    Publication statusPublished - 1997

    Bibliographical note

    Copyright (1997) American Physical Society.

    Keywords

    • SEMICONDUCTORS
    • FIELD
    • SPECTROSCOPY
    • QUANTUM-WELLS
    • WAVE-PACKETS
    • OSCILLATIONS
    • INTERFERENCE

    Fingerprint Dive into the research topics of 'Coherent dynamics of interwell excitons in GaAs/AlxGa1-xAs superlattices'. Together they form a unique fingerprint.

    Cite this