Boundary conditions for spin diffusion in disordered systems
Boundary conditions for spin diffusion in disordered systems
复制标题
无序系统中自旋扩散的边界条件
DOI：
10.1103/physrevb.74.115331
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发表时间：
2006
影响因子：
3.7
通讯作者：
S. Sarma
中科院分区：
文献类型：
--
作者：
V. Galitski;A. Burkov;S. Sarma
给出了自旋-轨道相互作用无序系统中自旋-电荷耦合输运边界条件的一般格式。为了说明该方法的应用，我们明确地推导了Rashba模型中自旋扩散的边界条件。由于表面自旋进动，边界条件是非平凡的，并且包含了耦合自旋密度不同分量的项。我们认为边界条件和相应的电场诱导自旋积累通常取决于边界的性质，因此自旋-轨道耦合系统中的自旋霍尔效应可以看作是一种非普适边缘现象。
We develop a general scheme of deriving boundary conditions for spin-charge coupled transport in disordered systems with spin-orbit interactions. To illustrate the application of the method, we explicitly derive boundary conditions for spin diffusion in the Rashba model. Due to the surface spin precession, the boundary conditions are nontrivial and contain terms, which couple different components of the spin density. We argue that boundary conditions and the corresponding electric-field-induced spin accumulation generally depend on the nature of the boundary and therefore the spin Hall effect in a spin-orbit coupled system can be viewed as a nonuniversal edge phenomenon.