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All-electric spin pumping in quantum channels with a single finger-gate capacitor

机译:用单个指栅电容器在量子通道中进行全电自旋泵浦

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摘要

In this paper, we show that a single finger-gate capacitor (FGC) can generate pure spin pumping in a quantum channel (QC). Two dynamic fields, ac spin-orbit interaction and ac potential energy, both induced by the FGC onto the QC, are the agents driving the spin pumping. Smooth spatial profiles of the two ac fields are taken into account both perturbatively and full numerically for the nonadiabatic spin pumping. Our perturbative approach reveals that the spin-pumping mechanism is resonant sideband processes associated with simultaneous coupling of the two ac fields with traversing carriers. Full sideband-process treatment is carried out numerically by a time-dependent scattering matrix method. The same spin-pumping mechanism holds also for the case of a single finger-gated QC, albeit with smaller pumping amplitudes.
机译:在本文中,我们证明了单指栅电容器(FGC)可以在量子通道(QC)中产生纯自旋泵浦。由FGC感应到QC上的两个动态场(交流自旋轨道相互作用和交流势能)是驱动自旋泵浦的因素。对于非绝热自旋泵浦,两个扰动场和整个数值场都考虑了平滑的空间分布。我们的摄动方法揭示了自旋泵浦机制是共振的边带过程,与两个交流场与穿越载波的同时耦合相关。通过与时间有关的散射矩阵方法对边带进行全过程处理。对于单手指门控的QC,即使泵浦幅度较小,该自旋泵浦机制也适用。

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  • 来源
    《Physical review》 |2017年第7期|075406.1-075406.10|共10页
  • 作者

    L. Y. Wang; C. S. Chu;

  • 作者单位

    Department of Physics, Fu Jen Catholic University, New Taipei City 24205, Taiwan;

    Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan;

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  • 正文语种 eng
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