Spin-Hall effect and spin-coherent excitations in a strongly confined two-dimensional hole gas

Details Spin-Hall effect and spin-coherent excitations in a strongly confined two-dimensional hole gas Spin-Hall effect and spin-coherent excitations in a strongly confined two-dimensional hole gas

2007-01-25

arxiv.org/abs/cond-mat/0701612v1

Physics

Condensed Matter

Statistical Mechanics

10 pages, 2 figures

Scientific paper

10.1103/PhysRevB.76.073314

Based on a rigorous quantum-kinetic approach, spin-charge coupled drift-diffusion equations are derived for a strongly confined two-dimensional hole gas. An electric field leads to a coupling between the spin and charge degrees of freedom. For weak spin-orbit interaction, this coupling gives rise to the intrinsic spin-Hall effect. There exists a threshold value of the spin-orbit coupling constant that separates spin diffusion from ballistic spin transport. In the latter regime, undamped spin-coherent oscillations are observed. This result is confirmed by an exact microscopic approach valid in the ballistic regime.

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