论文标题
通过自旋轨道耦合扩散自旋运动控制自旋松弛各向异性
Control of Spin Relaxation Anisotropy by Spin-Orbit-Coupled Diffusive Spin Motion
论文作者
论文摘要
使用磁光kerr旋转显微镜在A（001）GAAS二维电子气体中研究了自旋轨道相互作用下的时空自旋动力学。自旋极化电子脱离激发位置，由于扩散诱导的自旋轨道场而导致自旋进液。几乎在自旋轨道场和外部磁场之间取消的接近，诱导的自旋进液频率非线性地取决于扩散速度，这对于自旋轨道场与电子速度之间的传统线性关系而言是意外的。这种行为源自电气速度通过电子速度增强的旋转速度的增强，这是通过电子速度的增强的peron perondirediondirediondirediondiredional velocity peron vilecity per nisotropity wife peron velecity wife peron velecity wife peron velecity wife。我们证明，可以通过扩散电子运动来控制自旋弛豫各向异性，该各向异性被视为材料常数。
Spatiotemporal spin dynamics under spin-orbit interaction is investigated in a (001) GaAs two-dimensional electron gas using magneto-optical Kerr rotation microscopy. Spin polarized electrons are diffused away from the excited position, resulting in spin precession because of the diffusion-induced spin-orbit field. Near the cancellation between spin-orbit field and external magnetic field, the induced spin precession frequency depends nonlinearly on the diffusion velocity, which is unexpected from the conventional linear relation between the spin-orbit field and the electron velocity.This behavior originates from an enhancement of the spin relaxation anisotropy by the electron velocity perpendicular to the diffused direction. We demonstrate that the spin relaxation anisotropy, which has been regarded as a material constant, can be controlled via diffusive electron motion.
