具有自旋-轨道耦合作用的二维介观电子气中的自旋累积效应研究

Study on spin accumulation effect of 2D mesoscopic electronic gas with spin-orbit coupling

建立了在含自旋-轨道耦合相互作用的二维介观多端格子模型中求解散射波函数,进而在Landauer-Buttiker框架中得到计算多端的电导和自旋电导,以及任意非平衡局域物理量(如电流驱动之下的非平衡自旋累积)的一般方法.作为散射波函数法的一个直接应用,我们研究了具有Rashba型自旋-轨道耦合的二维电子气的二端结构.在给定电流密度条件下,我们得到线性输运区的非平衡自旋累积效应的结果,发现与其它的理论结果和最近的实验结果是定性一致的.

We construct a general method to solve the scattering wave function for a two-dimensional multi-terminal mesoscopic system with spin-orbit coupling, and to calculate terminal conductance, spin conductance, and any non-equilibrium local physical quantities（ e. g. , spin accumulation driven by electrical current）. As a direct application of lattice scattering wave function method, we study spin accumulation effect in a two-terminal system with Rashba form of spin-orbit coupling. Under the condition of fixed charge current density, the results obtained in linear transport regime is in consistent with other theoretical as well as recent experimental results.