arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1701.06017cond-mat.mes-hall
收藏

自旋霍尔效应中的Stationary states和屏蔽方程

Stationary states and screening equations in the spin-Hall effect

Jean-Eric Wegrowe

摘要:

本文在唯象双自旋通道模型的框架内讨论了自旋-霍尔效应的定态特性。结果表明,在自旋霍尔效应中,可以采用两种不同的定态定义,从而导致两种不同的态:零横向自旋流和非零纯自旋流.这种差异是由于对边缘附近区域的处理,其中发生电荷积累。导出了描述自旋轨道耦合引起的电荷积累的屏蔽方程。如果我们假设屏蔽长度相对于自旋扩散长度是小的,则与自旋翻转散射相关的自旋累积和由于自旋轨道耦合引起的自旋霍尔累积是两个独立的效应。相应的输运方程的Dyakonov-Perel方程进行了讨论。

英文摘要:

The characterization of the stationary states in the spin-Hall effect is discussed within the framework of the phenomenological two spin-channel model. It is shown that two different definitions of the stationary states can be applied in the spin-Hall effect, leading to two different types of state in the bulk: zero transverse spin-current or non-zero pure spin-current. This difference is due to the treatment of the region near the edges, in which electric charge accumulation occurs. The screening equations that describe the accumulation of electric charges due to spin-orbit coupling are derived. The spin-accumulation associated to spin-flip scattering and the spin-Hall accumulation due to spin-orbit coupling are two independent effects if we assume that the screening length is small with respect to the spin-diffusion length. The corresponding transport equations are discussed in terms of the Dyakonov-Perel equations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑