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Spin relaxation via exchange with donor impurity-bound electrons

机译:通过与供体杂质结合的电子交换而发生自旋弛豫

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摘要

At low temperatures, electrons in semiconductors are bound to shallow donor impurity ions, neutralizing their charge in equilibrium. Inelastic scattering of other externally injected conduction electrons accelerated by electric fields can excite transitions within the manifold of these localized states. Promotion of the bound electron into highly spin-orbit-mixed excited states drives a strong spin relaxation of the conduction electrons via exchange interactions, reminiscent of the Bir-Aronov-Pikus process where exchange occurs with valence band hole states. Through low-temperature experiments with silicon spin transport devices and complementary theory, we reveal the consequences of this spin depolarization mechanism both below and above the impact ionization threshold.
机译:在低温下,半导体中的电子会与浅的施主杂质离子结合,从而平衡其电荷。电场加速的其他外部注入的传导电子的非弹性散射会激发这些局部状态的歧管内的跃迁。将束缚电子提升为高度自旋轨道混合的激发态,通过交换相互作用推动了传导电子的强烈自旋弛豫,让人联想到Bir-Aronov-Pikus过程中的价带孔态发生交换。通过使用硅自旋输运器件的低温实验和互补理论,我们揭示了这种自旋去极化机理在碰撞电离阈值以下和以上的后果。

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  • 来源
    《Physical review》 |2015年第24期|241405.1-241405.5|共5页
  • 作者单位

    Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA ,Department of Physics, Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, USA;

    Department of Physics, Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, USA;

    Department of Physics, Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, USA;

    Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA ,Department of Electrical and Computer Engineering, University of Rochester, Rochester, New York 14627, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    impurity and defect levels; exchange interactions; spin polarized transport in semiconductors;

    机译:杂质和缺陷水平;交流互动;半导体中的自旋极化传输;

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