Dynamic magnetoconductance fluctuations and oscillations in mesoscopic wires and rings

D. Z. Liu, Ben Yu-Kuang Hu, C. A. Stafford, S. Das Sarma

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    Abstract

    Using a finite-frequency recursive Green's-function technique, we calculate the dynamic magnetoconductance fluctuations and oscillations in disordered mesoscopic normal-metal systems, incorporating interparticle Coulomb interactions within a self-consistent potential method. In a disorderd metal wire, we observe ergodic behavior in the dynamic conductance fluctuations. At low omega, the real part of the conductance fluctuations is essentially given by the dc universal conductance fluctuations while the imaginary part increases linearly from zero, but for omega greater than the Thouless energy and temperature, the fluctuations decrease as omega-1/2. Similar frequency-dependent behavior is found for the Aharonov-Bohm oscillations in a metal ring. However, the Al'tshuler-Aronov-Spivak oscillations, which predominate at high temperatures or in rings with many channels, are strongly suppressed at high frequencies, leading to interesting crossover effects in the omega dependence of the magnetoconductance oscillations.
    Original languageEnglish
    JournalPhysical Review B
    Volume50
    Issue number8
    Pages (from-to)5799-5802
    ISSN2469-9950
    DOIs
    Publication statusPublished - 1994

    Bibliographical note

    Copyright (1994) by the American Physical Society.

    Keywords

    • LOCALIZATION
    • CONDUCTIVITY
    • TRANSPORT
    • MATRIX
    • NORMAL-METAL RINGS
    • NOISE
    • UNIVERSAL CONDUCTANCE FLUCTUATIONS
    • RESISTANCE
    • HIGH-FREQUENCY FIELD

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