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首页> 外文期刊>Physical review >Quantum transport properties of graphene in the presence of randomly distributed spin-orbit coupling impurities
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Quantum transport properties of graphene in the presence of randomly distributed spin-orbit coupling impurities

机译：随机分布的自旋轨道耦合杂质存在下石墨烯的量子输运性质

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摘要

Randomly distributed heavy adatoms on a graphene sheet can effectively enhance local spin-orbit coupling (SOC), hereafter referred to as the SOC impurity. To perform a numerically exact solution of the real-space Kubo-Bastin formula, we study the quantum transport properties of a graphene sheet in the presence of an SOC impurity. We find that the SOC impurity can establish an imperfect quantum spin Hall (QSH) plateau in the band gap region, while nonzero spin Hall conductivity occurs in bulk band regions. In the presence of a magnetic field, the QSH plateau remains in the band gap, accompanying nonzero diagonal spin conductivity and half-integer quantum Hall conductivity outside the band gap. All these features arise from the dual role of the SOC impurity. On the one hand, it acts as a driving force to the QSH state. On the other hand, it is a special scatterer to affect the electronic transport properties in graphene.
机译：石墨烯片上随机分布的重原子原子可以有效地增强局部自旋轨道耦合（SOC），以下称为SOC杂质。为了执行真实空间Kubo-Bastin公式的精确数值解，我们研究了在存在SOC杂质的情况下石墨烯片的量子传输性质。我们发现，SOC杂质可以在带隙区域中建立不完善的量子自旋霍尔（QSH）平台，而非零自旋霍尔电导率发生在体能带区域。在存在磁场的情况下，QSH平台保持在带隙中，伴随着带隙之外的非零对角自旋电导率和半整数量子霍尔电导率。所有这些特征源于SOC杂质的双重作用。一方面，它充当了QSH状态的驱动力。另一方面，它是影响石墨烯中电子传输性能的特殊散射体。

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  • 来源
    《Physical review》 |2015年第24期|245438.1-245438.6|共6页
  • 作者

    Zhe Liu; Mingfeng Zhu; Yisong Zheng;

  • 作者单位

    Key Laboratory of Physics and Technology for Advanced Batteries, College of Physics, Jilin University, Ministry of Education, Changchun 130012, China;

    Key Laboratory of Physics and Technology for Advanced Batteries, College of Physics, Jilin University, Ministry of Education, Changchun 130012, China;

    Key Laboratory of Physics and Technology for Advanced Batteries, College of Physics, Jilin University, Ministry of Education, Changchun 130012, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    spin polarized transport; quantum phase transitions; electronic transport in nanoscale materials and structures;

    机译：自旋极化传输;量子相变纳米级材料和结构中的电子传输;

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