Non-diffusive spin dynamics in a two-dimensional electron gas

Details Non-diffusive spin dynamics in a two-dimensional electron gas Non-diffusive spin dynamics in a two-dimensional electron gas

2006-10-03

arxiv.org/abs/cond-mat/0610054v1

Phys. Rev. Lett. 98, 076604 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.98.076604

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 wavevector range from zero to $6\times 10^4$ cm$^{-1}$. We find that the spin polarization lifetime is maximal at nonzero wavevector, in contrast with expectation 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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