Disorder effects on the spin-Hall current in a diffusive Rashba two-dimensional heavy-hole system

Details Disorder effects on the spin-Hall current in a diffusive Rashba two-dimensional heavy-hole system Disorder effects on the spin-Hall current in a diffusive Rashba two-dimensional heavy-hole system

2005-03-15

arxiv.org/abs/cond-mat/0503352v4

Phys. Rev. B 72, 155314 (2005)

Physics

Condensed Matter

Materials Science

5 pages, 2 figures, Typos in the values of hole density corrected

Scientific paper

10.1103/PhysRevB.72.249901

We investigate the spin-Hall effect in a two-dimensional heavy-hole system with Rashba spin-orbit coupling using a nonequilibrium Green's function approach. Both the short- and long-range disorder scatterings are considered in the self-consistent Born approximation. We find that, in the case of long-range collisions, the disorder-mediated process leads to an enhancement of the spin-Hall current at high heavy-hole density, whereas for short-range scatterings it gives a vanishing contribution. This result suggests that the recently observed spin-Hall effect in experiment is a result of the sum of the intrinsic and disorder-mediated contributions. We have also calculated the temperature dependence of spin-Hall conductivity, which reveals a decrease with increasing the temperature.

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