Spin conductance switch effects in Rashba-Dresselhaus quantum wire with two step-likes

量子电子学报 ›› 2020, Vol. 37 ›› Issue (1): 99-109.

Spin conductance switch effects in Rashba-Dresselhaus quantum wire with two step-likes

徐中辉,洪兆海,罗兵,黄劲松,王晓慧

江西理工大学信息工程学院,江西赣州 341000

收稿日期:2019-08-11 修回日期:2019-09-06 出版日期:2020-01-28 发布日期:2020-01-28
通讯作者: 徐中辉 E-mail:longxister@163.com
作者简介:徐中辉(1982-江西赣县人，博士，副教授，从事低维系统电子输运方面的研究。Email: longxister@163.com
基金资助:
Supported by National Natural Science Foundation of China（国家自然科学基金，11864014，11447118，61765007，11847147），Scientific Research Foundation of Jiangxi Provincial Education Department（江西省教育厅科技项目，GJJ160633），Youth Science Foundation of science and Technology Department of Jiangxi Province（江西省科技厅青年科学基金，20151BAB212004）

Spin conductance switch effects in Rashba-Dresselhaus quantum wire with two step-likes

XU Zhonghui, HONG Zhaohai, LUO Bing, HUANG Jinsong,WANG Xiaohui

School of Information Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China

Received:2019-08-11 Revised:2019-09-06 Published:2020-01-28 Online:2020-01-28

摘要/Abstract

摘要： 利用紧束缚近似的非平衡格林函数法，研究了含Rashba和Dresselhaus自旋轨道耦合效应的双阶梯型量子线中电子的自旋电导开关效应。结果表明在正向偏压下，系统有大的自旋电导出现；但在反向偏压下，这个大的自旋电导会消失。并且自旋电导随着Rashba和Dresselhaus自旋轨道耦合效应的变化呈现圆形结构，表明Rashba和Dresselhaus自旋轨道耦合效应引起自旋电导的作用是一样的，因此可以通过调节Rashba或Dresselhaus自旋轨道耦合效应来控制自旋电导。该系统在未来有可能用来制作全电自旋电导开关的量子线。

关键词: 电子输运, 自旋电导开关效应, 非平衡格林函数法, 双阶梯型量子线, Rashba和Dresselhaus自旋轨道耦合效应

Abstract: The electron spin conductance switch effect in a two step-likes quantum wire under modulation of both the Rashba and Dresselhaus spin-orbit couplings (SOCs) is studied by using the non-equilibrium Green's function (NEGF) method with tight binding approximation scheme. It shows that a very large spin conductance occurs in the consideration system when the electrons transport in the forward biased case, while the spin conductance vanishes when the electrons transport in the backward biased case. Interestingly, the results show that the spin conductance of the system displays a "circular" profile versus both the Rashba and Dresselhaus SOCs, which it demonstrate that the two SOCs have the same role on inducing spin conductance. Therefore, one can control the spin conductance of the system by tuning either the Rashba or Dresselhaus SOC strengths, thus making the proposed quantum wire an all-electrical spin conductance diode in future.

Key words: electronic transport, spin conductance switch effects, non-equilibrium Green's function method, two step-likes quantum wire, Rashba and Dresselhaus spin-orbit couplings

徐中辉洪兆海罗兵黄劲松王晓慧. Spin conductance switch effects in Rashba-Dresselhaus quantum wire with two step-likes[J]. 量子电子学报, 2020, 37(1): 99-109.

XU Zhonghui, HONG Zhaohai, LUO Bing, HUANG Jinsong, WANG Xiaohui. Spin conductance switch effects in Rashba-Dresselhaus quantum wire with two step-likes[J]. Chinese Journal of Quantum Electronics, 2020, 37(1): 99-109.

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Spin conductance switch effects in Rashba-Dresselhaus quantum wire with two step-likes

Spin conductance switch effects in Rashba-Dresselhaus quantum wire with two step-likes

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