自旋霍尔效应产生的自旋漂移和扩散
Drift and Diffusion of Spins Generated by the Spin Hall Effect
摘要：
利用克尔旋转显微镜对n-GaAs沟道中由于自旋霍尔效应而产生的电自旋积累进行了成像，重点研究了其在磁场中的空间分布和时间平均行为。空间分辨成像表明，由于样品边界处产生的自旋极化的纵向漂移，在横向臂中观察到的自旋累积会发展。一维和二维漂移扩散模型被用来解释这些功能，提供了一个更完整的理解自旋积累和自旋霍尔效应的意见。
英文摘要：
Electrically generated spin accumulation due to the spin Hall effect is imaged in n-GaAs channels using Kerr rotation microscopy, focusing on its spatial distribution and time-averaged behavior in a magnetic field. Spatially-resolved imaging reveals that spin accumulation observed in transverse arms develops due to longitudinal drift of spin polarization produced at the sample boundaries. One- and two-dimensional drift-diffusion modeling is used to explain these features, providing a more complete understanding of observations of spin accumulation and the spin Hall effect.
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