Sequential tunneling in doped superlattices: Fingerprints of impurity bands and photon-assisted tunneling

Andreas Wacker, Antti-Pekka Jauho, S. Zeuner, S. K. Allen

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    Abstract

    We report a combined theoretical and experimental study of electrical transport in weakly coupled doped superlattices. Our calculations exhibit negative differential conductivity at sufficiently high electric fields for all dopings. In low-doped samples the presence of impurity bands modifies the current-voltage characteristics substantially, and we find two different current peaks whose relative height changes with the electron temperature. These findings can explain the observation of different peaks in the current-voltage characteristics with and without external THz irradiation in low-doped samples. From our microscopic transport model we obtain quantitative agreement with the experimental current-voltage characteristics without using any fitting parameters. Both our experimental data and our theory show that absolute negative conductance persists over a wide range of frequencies of the free-electron laser source.
    Original languageEnglish
    JournalPhysical Review B Condensed Matter
    Volume56
    Issue number20
    Pages (from-to)13268-13278
    ISSN0163-1829
    DOIs
    Publication statusPublished - 1997

    Bibliographical note

    Copyright (1997) by the American Physical Society.

    Keywords

    • LOCALIZATION
    • TRANSPORT
    • CONDUCTANCE
    • SPECTROSCOPY
    • MODEL
    • POLARIZABILITY
    • QUANTUM-WELLS
    • ELECTRIC-FIELD DOMAINS
    • OSCILLATIONS
    • SEMICONDUCTOR SUPERLATTICES

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