基于Rashba和Dresselhaus自旋轨道耦合的非均匀量子线中电子传输特性研究  

Study on Electron Transport Properties in Non-uniform Quantum Wires Based on Rashba and Dresselhaus Spin Orbit Coupling

作　　者：陈妍 刘誌 黄朵 CHEN Yan;LIU Zhi;HUANG Duo(School of Electrical Engineering and Automation,Jiangxi University of Science and Technology,Ganzhou 341000;School of Information Engineering,Jiangxi University of Science and Technology,Ganzhou 341000)

机构地区：[1]江西理工大学电气工程与自动化学院,赣州341000 [2]江西理工大学信息工程学院,赣州341000

出　　处：《现代制造技术与装备》2022年第12期107-109,113,共4页Modern Manufacturing Technology and Equipment

基　　金：江西省大学生创新训练项目“外加应力作用下二硫化钼中传导电流的相干调控”(S202110407040)。

摘　　要：采用非平衡格林函数方法,结合Landauer-Büttiker近似,研究基于Rashba和Dresselhaus两种自旋轨道耦合(Spin Orbit Coupling,SOC)的非均匀量子线中电子的自旋输运性质。结果发现,在Rashba和Dresselhaus两种SOC的影响下,这种非均匀量子线的电导表现出相当大的自旋极化现象。此外,这两种SOC的强度对电子自旋极化的大小和符号有很大影响。Rashba和Dresselhaus的SOC在电子自旋极化中起着相同的调制作用,可为全电的自旋电子器件设计提供参考。The spin transport properties of electrons in inhomogeneous quantum wires based on Rashba and Dresselhaus Spin Orbit Coupling(SOC) are studied by using the non-equilibrium Green’s function method and landauer-Büttiker approximation.The results show that under the influence of two kinds of SOC, Rashba and Dresselhaus, the conductance of this kind of nonuniform quantum wire shows a considerable spin polarization phenomenon, and the strength of these two SOC has a great influence on the size and sign of electron spin polarization. The SOC of Rashba and Dresselhaus play the same modulation role in electron spin polarization, and the research results are expected to provide reference for the design of all electric spin electronic devices.

关 键 词：非均匀量子线 格林函数 自旋极化输运 自旋轨道耦合(SOC) 

分 类 号：O469[理学—凝聚态物理]