Spin polarization in biased Rashba-Dresselhaus two-dimensional electron systems

Details Spin polarization in biased Rashba-Dresselhaus two-dimensional electron systems Spin polarization in biased Rashba-Dresselhaus two-dimensional electron systems

2007-09-13

arxiv.org/abs/0709.2054v1

Physics

Condensed Matter

Other Condensed Matter

12 pages

Scientific paper

10.1103/PhysRevB.76.205326

Based on spin-charge coupled drift-diffusion equations, which are derived from kinetic equations for the spin-density matrix in a rigorous manner, the electric-field-induced nonequilibrium spin polarization is treated for a two-dimensional electron gas with both Rashba and Dresselhaus spin-orbit coupling. Most emphasis is put on the consideration of the field-mediated spin dynamics for a model with equal Rashba and Dresselhaus coupling constants, in which the spin relaxation is strongly suppressed. Weakly damped electric-field-induced spin excitations are identified, which remind of space-charge waves in crystals.

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