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
References in corpus (9)
- Dissipationless Quantum Spin Current at Room Temperature
- Spin current and polarization in impure 2D electron systems with spin-orbit coupling
- On A Proper Definition of Spin Current
- Generating Spin Currents in Semiconductors with the Spin Hall Effect
- Transport equations for a two-dimensional electron gas with spin-orbit interaction
- High temperature spin dephasing in n-typed GaAs quantum wells
- Spin Hall effect of conserved current: Conditions for a nonzero spin Hall current
- On boundary conditions for spin diffusion equations with Rashba spin-orbit interaction
- Long-Lived Spin Coherence States