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Optically induced density depletion of the two-dimensional electron system in GaAs/AlxGa1-xAs heterojunctions

Hayne, Manus and USHER, A and PLAUT, A S and PLOOG, K (1994) Optically induced density depletion of the two-dimensional electron system in GaAs/AlxGa1-xAs heterojunctions. Physical Review B, 50 (23). pp. 17208-17216. ISSN 0163-1829

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    Abstract

    We report measurements of optically induced density depletion of the two-dimensional electron system formed at the interface of a GaAs/AlxGa1-xAs heterojunction with a δ-doped layer of Be acceptors in the GaAs 250 Å from the interface. Our measurements show that at low laser power the depletion effect is controlled by the recombination of two-dimensional electrons with photoexcited holes that have become bound to the Be acceptors. The point at which all the Be acceptors in the sample have been neutralized by photoexcited holes is indicated by the sudden appearance of free holes in the GaAs, which then control the density depletion in the high-power regime. We present a comprehensive dynamic model of the depletion effect that includes both regimes, and calculate the densities and mobilities of the carriers involved in the process.

    Item Type: Article
    Journal or Publication Title: Physical Review B
    Additional Information: © 1994 The American Physical Society
    Subjects: Q Science > QC Physics
    Departments: Faculty of Science and Technology > Physics
    ID Code: 54547
    Deposited By: ep_importer_pure
    Deposited On: 25 May 2012 10:53
    Refereed?: Yes
    Published?: Published
    Last Modified: 09 Apr 2014 23:31
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/54547

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