Investigation Of Excitonic Saturation By Time-Resolved Circular-Dichroism In Gaas-Alxga1-Xas Multiple-Quantum Wells

    Authors

    M. J. Snelling; P. Perozzo; D. C. Hutchings; I. Galbraith;A. Miller

    Comments

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    Abbreviated Journal Title

    Phys. Rev. B

    Keywords

    SPIN-RELAXATION; OPTICAL NONLINEARITIES; EXCITED SEMICONDUCTORS; HETEROSTRUCTURES; Physics, Condensed Matter

    Abstract

    Time- and wavelength-resolved circular dichroism of the excitonic saturation in GaAs-AlxGa1-xAs multiple quantum wells at room temperature is investigated using a degenerate excite-probe method. For moderate excitation, the effects of photogenerated carriers on the heavy-hole exciton resonance are separately identified as the contributions of phase-space filling and Coulombic effects (screening and line-shape broadening). These contributions are observed to be of a similar magnitude. The induced circular dichroism of the exciton saturation was observed to decay with a time constant of 50 ps, which is attributable to electron spin relaxation.

    Journal Title

    Physical Review B

    Volume

    49

    Issue/Number

    24

    Publication Date

    1-1-1994

    Document Type

    Article

    Language

    English

    First Page

    17160

    Last Page

    17169

    WOS Identifier

    WOS:A1994NW02700030

    ISSN

    0163-1829

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