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arXiv 1007.0853cond-mat.mes-hall
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具有Rashba自旋轨道耦合的二维电子系统的径向自旋阻碍

Radial Spin Helix in Two-Dimensional Electron Systems with Rashba Spin-Orbit Coupling

Yuriy V. Pershin, Valeriy A. Slipko

摘要:

我们提出了一个长寿命的自旋极化结构,径向自旋螺旋,并研究其弛豫动力学。为此,从一个简单的和物理上明确的考虑自旋输运,我们推导出一个系统的方程自旋极化密度,并找到它的一般解决方案,在轴对称的情况下。结果表明,具有一定周期的径向自旋螺旋的弛豫比均匀自旋极化和平面自旋螺旋慢。重要的是,径向自旋螺旋中心的自旋极化在短时间内几乎保持不变。在较长的时间,当初始非指数弛豫区域结束时,径向自旋螺旋的弛豫以与描述平面自旋螺旋的弛豫的时间常数相同的时间常数发生。

英文摘要:

We suggest a long-lived spin polarization structure, a radial spin helix, and study its relaxation dynamics. For this purpose, starting with a simple and physically clear consideration of spin transport, we derive a system of equations for spin polarization density and find its general solution in the axially symmetric case. It is demonstrated that the radial spin helix of a certain period relaxes slower than homogeneous spin polarization and plain spin helix. Importantly, the spin polarization at the center of the radial spin helix stays almost unchanged at short times. At longer times, when the initial non-exponential relaxation region ends, the relaxation of the radial spin helix occurs with the same time constant as that describing the relaxation of the plain spin helix.

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