Nondiffusive spin dynamics in a two-dimensional electron gas

被引：75
|
作者：
Weber, C. P. [1 ]
Orenstein, J.
Bernevig, B. Andrei
Zhang, Shou-Cheng
Stephens, Jason
Awschalom, D. D.
机构：
[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
[3] Stanford Univ, Dept Phys, Stanford, CA 94305 USA
[4] Univ Calif Santa Barbara, Ctr Spintron & Quatum Computat, Santa Barbara, CA 93106 USA
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 07期
关键词：
D O I：
10.1103/PhysRevLett.98.076604
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We describe measurements of spin dynamics in the two-dimensional electron gas in GaAs/GaAlAs quantum wells. Optical techniques, including transient spin-grating spectroscopy, are used to probe the relaxation rates of spin polarization waves in the wave vector range from zero to 6x10(4) cm(-1). We find that the spin polarization lifetime is maximal at a nonzero wave vector, in contrast with expectations based on ordinary spin diffusion, but in quantitative agreement with recent theories that treat diffusion in the presence of spin-orbit coupling.
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页数：4
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