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Optical transient-grating measurements of spin diffusion and relaxation in a two-dimensional electron gas

by Weber, Christopher Phillip, PhD, UNIVERSITY OF CALIFORNIA, BERKELEY, 2005, 0 pages; 3211561

Abstract: Spin diffusion in n-GaAs quantum wells, as measured by our optical transient-grating technique, is strongly suppressed relative to that of charge. Over a broad range of temperatures and dopings, the suppression of D_s relative to D_c agrees quantitatively with the prediction of 'spin Coulomb drag' theory, which takes into account the exchange of spin in electron-electron collisions. Moreover, the spin-diffusion length, L_s, is a nearly constant 1 μm over the same range of T and n, despite D_s's varying by nearly two orders of magnitude. This constancy supports the D'yakonov-Perel'-Kachorovskii model of spin relaxation through interrupted precessional dephasing in the spin-orbit field.

Advisor:	Orenstein, Joseph
School:	UNIVERSITY OF CALIFORNIA, BERKELEY
Source:	DAI-B 67/04, p. 2051, Oct 2006
Source Type:	PhD
Subjects:	Condensation
Publication Number:	3211561

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