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Anisotropy of the spin-polarized edge current in monolayer transition metal dichalcogenide zigzag nanoribbons

机译：单层过渡金属二硫代甲基Zigzag Nanoribbons中的旋转偏振边缘电流的各向异性

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摘要

We report anisotropic spin polarization of edge currents in MoS_2 and WS_2 monolayer zigzag nanoribbons (ZNRs) deposited on either nonmagnetic or ferromagnetic insulator substrates. We employ an 11 -band tight-binding model to calculate the electronic band structures of transition metal dichalcogenide (TMDC) monolayers and their corresponding nanoribbons in the presence of Rashba spin-orbit coupling (RSOC) and magnetic proximity effect produced by ferromagnetic substrate. We adopt the nonequilibrium Green's function method together with Landauer-Buettiker formalism to study the quantum transport behavior stemming from the edge states of ZNRs. We demonstrate that the spin-polarized edge current can be generated in both MoS_2 and WS_2 ZNRs with RSOC. We find that the spin polarization spreads out in all three directions. This is in stark contrast to what occurs in zigzag graphene nanoribbons, for which the polarization only exists in the transverse direction (across the width of ribbons). In addition, the spin polarization direction strongly depends on the strength of the intrinsic SOC component. The interplay of Rashba and intrinsic SOC is crucial for the spin polarization of the currents in any spatial direction. For TMIDCs with stronger intrinsic SOC such as in WS_2 monolayer ZNRs, we observe that the spin polarization along the perpendicular direction to the plane of the ZNR can be as large as 90%. Moreover, the unusual anisotropy of the spin polarization can be further enhanced by the magnetic proximity effect. These results open up possibilities for the generation of tunable high-spin polarization currents in ZNRs without application of an external magnetic field.
机译：我们在沉积在非磁性或铁磁绝缘体基板上的MOS_2和WS_2单层Zigzag纳米杆（ZnRS）中报告边缘电流的各向异性自旋极化。我们采用11带紧绑定模型来计算过渡金属二甲烷（TMDC）单层的电子带结构及其相应的纳米杆在Rashba旋转轨道耦合（RSOC）和由铁磁基底产生的磁性接近效果。我们与Landauer-Buettiker形式主义采用非Quilibrium绿色的功能方法，以研究ZnRS边缘状态的量子传输行为。我们证明可以在MOS_2和WS_2 ZnR中产生自旋极化边缘电流，其中RSOC。我们发现自旋极化在所有三个方向上展开。这与Zigzag石墨烯纳米中发生的情况呈现出与Zigzag Graphene纳米队的发生对比，其偏振仅存在于横向（横跨带的宽度）中。另外，自旋极化方向强烈取决于本征SOC分量的强度。 RASHBA和固有SOC的相互作用对于任何空间方向上的电流的自旋极化是至关重要的。对于具有较强的内在SOC的TMIDC，例如在WS_2单层ZnRS中，我们观察到沿ZnR平面的垂直方向的自旋偏振可以大至90％。此外，通过磁性接近效应，可以进一步增强自旋极化的异常各向异性。这些结果在ZnR中产生可调谐高自旋极化电流的可能性，而无需施加外部磁场。

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  • 来源
    《Physical review》 |2020年第19期|195422.1-195422.13|共13页
  • 作者

    J. H. Correa; A. C. Dias; L. Villegas-Lelovsky; Jiyong Fu; Leonor Chico; Fanyao Qu;

  • 作者单位

    Department of Physics Qufu Normal University 273165 Qufu Shandong China Instituto de Fisica Universidade de Brasilia Brasilia-DF 70919-970 Brazil;

    Instituto de Fisica Universidade de Brasilia Brasilia-DF 70919-970 Brazil;

    Departamento de Fisica IGCE Universidade Estadual Paulista 13506-900 Rio Claw Sao Paulo Brazil Departamento de Fisica Centro de Ciencias Exalas e de Tecnologia Universidade Federal de Sao Carlos Sao Carlos Sao Paulo 13565-905 Brazil;

    Department of Physics Qufu Normal University 273165 Qufu Shandong China;

    Instituto de Ciencia de Materiales de Madrid Consejo Superior de Investigaciones Cientificas C/ Sor Juana Ines de la Cruz 3 28049 Madrid Spain;

    Instituto de Fisica Universidade de Brasilia Brasilia-DF 70919-970 Brazil;

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