Semiclassical path integral approach on spin relaxations in narrow wires

Details Semiclassical path integral approach on spin relaxations in narrow wires Semiclassical path integral approach on spin relaxations in narrow wires

2009-02-17

arxiv.org/abs/0902.2828v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 6 figures (to appear in Phys. Rev. B)

Scientific paper

10.1103/PhysRevB.79.125310

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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