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Quantum charge and spin pumping in monolayer phosphorene

机译：单层磷烯的量子电荷和旋转泵送

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摘要

We study quantum-charge and spin-transport properties and the effects of in-plane strain on the charge and spin currents in a phosphorene monolayer using an adiabatic pumping regime. To achieve this goal, we proposed a device with three external ac gate voltages as oscillating potential barriers that are responsible for the generation of dc pumped current. Using exchange magnetic field induced by proximity effect of a ferromagnetic insulator, we determine the conditions in which fully spin-polarized current and pure spin current (with zero charge current) can be obtained. It is shown that the pumped current in the three-barrier case is about two times greater than the pumped current in a two-barrier system. The effect of strain is investigated and it is found that the spin current increases up to two orders of magnitude by applying the uniaxial strain which shows that the proposed device has high sensitivity to strain and could be used as straintronic devices such as strain switches and strain sensors. Also, in the same conditions, the pumped current in phosphorene is two, four, and five orders of magnitude greater than the pumped current in MoS_2, silicene, and graphene, respectively. These properties show that phosphorene can be considered as a two- dimensional (2D) semiconductor with great potential for the fabrication of novel spintronic and straintronic devices that can overcome some of the limitations exhibited by conventional 2D materials.
机译：我们使用绝热泵送方案研究量子电荷和旋转式旋转性能以及面内应变在磷烯单层中的磷烯单层中的旋转电流的影响。为实现这一目标，我们提出了一种具有三个外部交流栅极电压的设备，作为负责DC泵送电流的振荡势垒的振荡屏障。使用由铁磁绝缘体的接近效应引起的交换磁场，确定可以获得完全自旋极化电流和纯旋转电流（具有零充电电流）的条件。结果表明，三个屏障壳体中的泵电流大约比双屏障系统中的泵电流大约两倍。研究了应变的影响，发现旋转电流通过施加单轴应变而增加了两个级别，表明所提出的装置对菌株具有很高的敏感性，并且可以用作诸如应变开关和应变的串行装置传感器。而且，在相同的条件下，磷烯中的泵浦电流分别比MOS_2，硅和石墨烯中的泵电流大的两个，四个和五个数量级。这些性质表明，磷烯可以被认为是一种二维（2D）半导体，其具有可以克服常规2D材料呈现的一些局限性的新型旋转反应和串的施工潜力。

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  • 来源
    《Physical review》 |2020年第3期|035435.1-035435.9|共9页
  • 作者

    Hossein Nikoofard; Mahdi Esmaeilzadeh; Ebrahim Heidari-Semiromi; Jia Tao Sun;

  • 作者单位

    Department of Physics Iran University of Science and Technology Tehran 16844 Iran Department of Physics University of Kashan Kashan 87317-53153 Iran;

    Department of Physics Iran University of Science and Technology Tehran 16844 Iran;

    Department of Physics University of Kashan Kashan 87317-53153 Iran;

    Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China;

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