Nondiffusive spin dynamics in a two-dimensional electron gas

被引：74

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.

引用

页数：4

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