Controllable Spin Polarization of Charge Current by Rashba Spin Orbital Coupling  

作　　者：CUI Juan YANG Yong-Hong WANG Jun 

机构地区：[1]Department of Physics, Southeast University, Nanjing 210096, China [2]Department of Physics, Yancheng Techers University, Yancheng 224002, China

出　　处：《Communications in Theoretical Physics》2009年第11期949-952,共4页理论物理通讯（英文版）

基　　金：Supported by National Natural Science Foundation of China under Grant No.10704016;Natural Science Foundation of Jiangsu Province under Grant Nos.BK2007100;Ministry of Education of China under Grant No.MEC-20070286036

摘　　要：We report a theoretic study on modulating the spin polarization of charge current in a mesoscopic fourterminal device of cross structure by using the inverse spin hall effect. The scattering region of device is a two-dimensional electron gas （2DEG） with Rashba spin orbital interaction （RSOI）, one of lead is ferromagnetic metal and other three leads are spin-degenerate normal metals. By using Landauer-Biittiker formalism, we found that when a longitudinal charge current flows through 2DEG scattering region from FM lead by external bias, the transverse current can be either a pure spin current or full-polarized charge current due to the combined effect of spin hall effect and its inverse process, and the polarization of this transverse current can be easily controlled by several device parameters such as the Fermi energy, ferromagnetic magnetization, and the RSOI constant. Our method may pave a new way to control the spin polarization of a charge current.

关 键 词：spin polarization spin-orbital coupling spin-Hall effect Green＇s function 

分 类 号：TN6[电子电信—电路与系统] O572[理学—粒子物理与原子核物理]