Nondiffusive spin dynamics in a two-dimensional electron gas

C. P. Weber; J. Orenstein; B. Andrei Bernevig; Shou Cheng Zhang; Jason Stephens; D. D. Awschalom

doi:10.1103/PhysRevLett.98.076604

Nondiffusive spin dynamics in a two-dimensional electron gas

C. P. Weber, J. Orenstein, B. Andrei Bernevig, Shou Cheng Zhang, Jason Stephens, D. D. Awschalom

Research output: Contribution to journal › Article › peer-review

69 Scopus citations

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 6×104cm-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.

Original language	English (US)
Article number	076604
Journal	Physical review letters
Volume	98
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevLett.98.076604
State	Published - Feb 15 2007
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1103/PhysRevLett.98.076604

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AU - Orenstein, J.

AU - Bernevig, B. Andrei

AU - Zhang, Shou Cheng

AU - Stephens, Jason

AU - Awschalom, D. D.

PY - 2007/2/15

Y1 - 2007/2/15

N2 - 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 6×104cm-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.

AB - 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 6×104cm-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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Nondiffusive spin dynamics in a two-dimensional electron gas

Abstract

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