Non-diffusive spin dynamics in a two-dimensional electrongas [electronic resource].

Published:: Washington, D.C. : United States. Dept. of Energy, 2006.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators:: United States. Department of Energy, National Science Foundation (U.S.), and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

We describe measurements of spin dynamics in thetwo-dimensional electron gas in GaAs/GaAlAs quantum wells. Opticaltechniques, including transient spin-grating spectroscopy, are used toprobe the relaxation rates of spin polarization waves in the wavevectorrange from zero to 6E4 cm-1. We find that the spin polarization lifetimeis maximal at nonzero wavevector, in contrast with expectation based onordinary spin diffusion, but in quantitative agreement with recenttheories that treat diffusion in the presence of spin-orbitcoupling.

Report Numbers:

E 1.99:lbnl--62092
lbnl--62092

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Note:

Published through SciTech Connect.
12/12/2006.
"lbnl--62092"
": KC0202020"
Physical Review Letters 98 ISSN 0031-9007; PRLTAO FT
Zhang, Shou-Cheng; Orenstein, Joseph; Awschalom, David D.; Weber, Christopher P.; Bernevig, B. Andrei; Stephens, Jason.
Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)

Funding Information:

DE-AC02-05CH11231
NSF:DMR-0342832,DMR-0305223
504601

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