Excitons, Biexcitons and Dephasing in GaAs T-shaped quantum wires

Wolfgang Langbein, Hannes Gislason, Jørn Märcher Hvam

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    Abstract

    The binding energy of excitons and biexcitons and the exciton dephasing in T-shaped GaAs quantum wires is investigated by transient four-wave mixing. The T-shaped structure is fabricated by cleaved-edge overgrowth and its geometry is engineered to optimize the one-dimensional confinement. In this wire of 6.6x24 nm2 size we find a one-dimensional confinement of more than 20meV, an inhomogeneous broadening of only 3.4 meV. The measured exciton binding energy of 12 meV is in good agreement with numerical calculations. The biexciton binding energy of 2.0 meV is less than in comparable quantum well structures due to the different confinement of electron and hole in the T-shaped wire. A dispersion of the homogeneous linewidth within the inhomogeneous broadening due to phonon-assisted relaxation is observed. An exciton acoustic-phonon scattering coefficient of 6.1 +-0.5 ìeV/K is found, which is larger than in comparable quantum-well structures.
    Original languageEnglish
    Title of host publicationProceeding of Spring Meeting of the Condensed Matter Division of the Deutsche Physikalische Gesellschaft
    Publication date2000
    Publication statusPublished - 2000
    EventSpring Meeting of the Condensed Matter Division of the Deutsche Physikalische Gesellschaft - Regensburg, Germany
    Duration: 22 Mar 200026 Mar 2000

    Conference

    ConferenceSpring Meeting of the Condensed Matter Division of the Deutsche Physikalische Gesellschaft
    Country/TerritoryGermany
    CityRegensburg
    Period22/03/200026/03/2000

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