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Transient Current Behavior of Nanoscale Objects: Role of Displacement Current and Polaron Effects

机译:纳米尺度物体的瞬态电流行为:位移电流和极化子效应的作用

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摘要

The transient current behavior of nanoscale objects is theoretically investigated based on the reduced quantum Liouville equation scheme. Applying the scheme to an atomic contact junction reveals that the displacement current plays an essential role in the transient current behavior. Moreover, the influence of electron-phonon interaction on the transient current in the junction is studied. The current relaxation time increases exponentially with the electron-phonon coupling strength, while the steady-state current decreases exponentially. These effects can be understood in terms of the polaron mass.
机译:基于简化的量子Liouville方程方案,从理论上研究了纳米尺度物体的瞬态电流行为。将方案应用于原子接触结表明,位移电流在瞬态电流行为中起着至关重要的作用。此外,研究了电子-声子相互作用对结中瞬态电流的影响。电流弛豫时间随电子-声子耦合强度呈指数增长,而稳态电流呈指数下降。这些影响可以通过极化子质量来理解。

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  • 来源
    《Japanese journal of applied physics》 |2009年第7issue1期|075001.1-075001.6|共6页
  • 作者单位

    Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan;

    Department of Materials Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan;

    Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan Research Institute for Science and Technology, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan;

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