Role of relaxation in spin Hall effect

Details Role of relaxation in spin Hall effect Role of relaxation in spin Hall effect

2005-05-18

arxiv.org/abs/cond-mat/0505437v1

Phys. Rev. B 72, 081301 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures, REVTeX

Scientific paper

10.1103/PhysRevB.72.081301

The role of the relaxation due to the impurity scattering and/or the contacts to leads/electrodes are studied for the spin Hall effect (SHE). Relaxation is essential to attain the steady state and also to the spin accumulation, but has been considered to be harmful for the intrinsic SHE (ISHE). These issues are examined quantitatively on two types of 2D models, i.e., (a) Rashba model for $n$-type GaAs, and (b) Luttinger model for $p$-type GaAs. It is found that ISHE is robust against the realistic strength of the disorder producing the observable amount of the spin accumulation. Especially in model (b) the spin current and the accumulation are an order of magnitude larger than those in model (a). Experimental observations are discussed quantitatively from these results.

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