基于类叉形纳米结构的自旋极化电流分离器  

Spin-Polarized Current Separator Based on a Fork-Like Nanostructure

作　　者：徐中辉[1,2] 肖贤波[3] 肖文[1] 陈宇光[1] 

机构地区：[1]同济大学物理系,上海200092 [2]江西理工大学信息工程学院,赣州341000 [3]江西中医学院计算机学院,南昌330004

出　　处：《人工晶体学报》2013年第1期88-92,104,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(11147156;10774112);江西省教育厅科技项目(GJJ12355)

摘　　要：采用递归格林函数法研究了含Rashba自旋轨道耦合(spin-orbit coupling,简记SOC)效应的类叉形纳米结构中电子的自旋极化输运性质。结果表明在非自旋极化电子入射时系统的两个出射端能得到大小相等但极化方向相反的两个自旋极化电流,其物理根源是由Rashba SOC和系统的几何结构导致的两出射端具有大小不相等的自旋电导。当系统中引入无序时,无序强度对自旋极化电流的影响较弱。这些效应说明所研究的系统有可能用来设计自旋极化电流分离器。The spin-polarized electron transport for a fork-like nanostructure with Rashba spin-orbit coupling （SOC） is investigated via the spin-resolved lattice Green function method. It is shown that the magnitudes of the two spin-polarized currents from the injecting lead to the two output leads are always equal but their signs are opposite when the spin-unpolarized electrons injected from the input lead. The physical mechanism of this device arises from the fact that the different spin-dependent conductance caused by the effects of Rashba SOC and the geometrical structure of the system. Further study shows that the spin-polarized current is robust against disorder, those results may provide an effective way to design a spin-polarized current separator without containing any magnetic materials or applying a magnetic field.

关 键 词：类叉形纳米结构 自旋极化输运 RASHBA自旋轨道耦合 

分 类 号：O471[理学—半导体物理]