Nondiffusive spin dynamics in a two-dimensional electron gas |
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| Authors: | Weber C P Orenstein J Bernevig B Andrei Zhang Shou-Cheng Stephens Jason Awschalom D D |
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| Institution: | Physics Department, University of California, Berkeley and Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA. |
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| Abstract: | 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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