Browsing by Author "Lo, Hui-Fen"

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Semiclassical path integral approach for spin relaxations in narrow wires
(2009-03-01)
Chang, Cheng-Hung
;
Tsai, Jengjan
;
Lo, Hui-Fen
;
Mal'shukov, A. G.
;
數學建模與科學計算所(含中心)
The semiclassical path integral (SPI) method has been applied for studying spin relaxation in a narrow two-dimensional strip with the Rashba spin-orbit interaction. Our numerical calculations show 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-type relaxation. The SPI method has also been employed to calculate the relaxation of the particularly long-lived helix mode. Good agreement has been found with calculations based on the diffusion theory.