Coulomb Drag as a Probe of Coupled Plasmon Modes in Parallel Quantum Wells

Karsten Flensberg, Ben Yu-Kuang Hu

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    Abstract

    We show theoretically that the Coulomb drag rate between two parallel quasi-two-dimensional electron gases with equal Fermi velocities is substantially enhanced by the coupled acoustic and optic plasmon modes at temperatures T≳0.2TF (where TF is the Fermi temperature) for experimentally relevant parameters. The acoustic mode causes a sharp upturn in the scaled drag rate with increasing temperature at T≈0.2TF. Other experimental signatures of the plasmon-dominated drag rate are a d-3 dependence on the well separation d and a peak as a function of relative densities at matched Fermi velocities.
    Original languageEnglish
    JournalPhysical Review Letters
    Volume73
    Issue number26
    Pages (from-to)3572-3575
    ISSN0031-9007
    DOIs
    Publication statusPublished - 1994

    Bibliographical note

    Copyright (1994) by the American Physical Society.

    Keywords

    • 2-DIMENSIONAL ELECTRON-SYSTEMS
    • SCATTERING
    • MUTUAL DRAG
    • HOLE TRANSPORT
    • EXCITATIONS
    • HETEROSTRUCTURES
    • 2D
    • GAS LAYERS
    • SPATIALLY SEPARATED ELECTRON

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