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arXiv · 0902.2828

Semiclassical path integral approach on spin relaxations in narrow wires

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

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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Cheng-Hung Chang, Jengjan Tsai, Hui-Fen Lo, A. G. Mal'shukov. 2009-02-18. Semiclassical path integral approach on spin relaxations in narrow wires. https://doi.org/10.1103/physrevb.79.125310

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