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arXiv 0902.2828cond-mat.mes-hallcond-mat.mtrl-sci
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半经典路径积分方法研究细线中的自旋弛豫

Semiclassical path integral approach on spin relaxations in narrow wires

Cheng-Hung Chang, Jengjan Tsai, Hui-Fen Lo, A. G. Mal'shukov

摘要:

采用半经典路径积分方法研究了具有Rashba自旋轨道相互作用的二维窄条中的自旋弛豫。数值计算结果与实验数据吻合较好,但实验结果的某些特征尚不清楚。我们还计算了一个均匀的自旋密度分布在弹道制度的非常窄的电线的松弛。随着线宽的减小,自旋极化呈现出从指数衰减到振荡的类贝塞尔弛豫的转变。SPI方法也被用来计算特别长寿命的螺旋模式的弛豫。已发现一个很好的协议与基于扩散理论的计算。

英文摘要:

The semiclassical path integral method has been applied for studying spin relaxation in a narrow 2D strip with the Rashba spin-orbit interaction. Our numerical calculations show a good agreement with the experimental data, although some features of experimental results are not clear yet. We also calculated the relaxation of a uniform spin-density distribution in the ballistic regime of very narrow wires. With the decreasing wire width, the spin polarization exhibits a transition from the exponential decay to the oscillatory Bessel-like relaxation. The SPI method has been also employed to calculate the relaxation of the particularly long-lived helix mode. A good agreement has been found with calculations based on the diffusion theory.

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