Coupled spin-charge drift-diffusion approach for a two-dimensional electron gas with Rashba spin-orbit coupling
arXiv:cond-mat/0701782 · doi:10.1103/PhysRevB.75.205317
Abstract
Based on kinetic equations for the density matrix, drift-diffusion equations are derived for a two-dimensional electron gas with Rashba spin-orbit coupling. Universal results are obtained for the weak coupling case. Most interesting is the observation that with increasing spin-orbit coupling strengths there is a sharp transition between spin diffusion and ballistic spin transport. For strong spin-orbit coupling, when the elastic scattering time is much larger than the spin relaxation time, undamped spin-coherent waves are identified. The existence of these long-lived spin-coherent states is confirmed by exact analytical results obtained from microscopic kinetic equations valid in the ballistic regime.
16 pages, 3 figures
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- Spin dynamics in semiconductors
- Theory of coupled spin-charge transport due to spin-orbit interaction in inhomogeneous two-dimensional electron liquids
- Electric-field induced spin excitations in two-dimensional spin-orbit coupled systems
- Microscopic theory for the Doppler velocimetry of spin propagation in semiconductor quantum wells
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