Linear optical absorption spectra of mesoscopic structures in intense THz fields: Free-particle properties

Kristinn Johnsen, Antti-Pekka Jauho

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    Abstract

    We theoretically study the effect of THz radiation on the linear optical absorption spectra of semiconductor structures. A general theoretical framework, based on nonequilibrium Green functions, is formulated and applied to the calculation of linear optical absorption spectrum for several nonequilibrium mesoscopic structures. We show that a blueshift occurs and sidebands appear in bulklike structures, i.e., the dynamical Franz-Keldysh effect [A.-P. Jauho and K. Johnsen, Phys. Rev. Lett. 76, 4576 (1996)]. An analytic calculation leads to the prediction that in the case of superlattices distinct stable steps appear in the absorption spectrum when conditions for dynamical localization are met. [S0163-1829(95)03412-2].
    Original languageEnglish
    JournalPhysical Review B
    Volume57
    Issue number15
    Pages (from-to)8860-8872
    ISSN2469-9950
    DOIs
    Publication statusPublished - 1998

    Bibliographical note

    Copyright (1998) by the American Physical Society.

    Keywords

    • DYNAMIC LOCALIZATION
    • PHOTOEXCITED SEMICONDUCTORS
    • ELECTRIC-FIELDS
    • QUANTUM-WELLS
    • CARRIER DYNAMICS
    • SEMICONDUCTOR SUPERLATTICES
    • COHERENT
    • BLOCH OSCILLATIONS
    • MONTE-CARLO APPROACH
    • EMISSION

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