2008/07/14 by P. Kleinert, V. V. Bryksin
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.dis-nn #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.79.045317
17 pages, 3 figures
arxiv created 2008/07/14 · openalex publication_date 2009/01/28 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Rigorous coupled spin-charge drift-diffusion equations are derived from quantum-kinetic equations for the spin-density matrix that incorporate effects due to \mathbitk-linear spin-orbit interaction, an electric field, and the elastic scattering on nonmagnetic impurities. The explicit analytical solution for the induced magnetization exhibits a pole structure, from which the dispersion relations of spin excitations are identified. Applications of the general approach refer to the excitation of long-lived field-induced spin waves by optically generated spin and charge patterns for a planar and cylindrical geometry. This approach transfers methods known in the physics of space-charge waves to the treatment of long-lived spin eigenmodes that appear in planar and nonplanar two-dimensional electron systems with spin-orbit interaction. In addition, the amplification of an oscillating electric field by spin injection is demonstrated.