Electric-field induced spin excitations in two-dimensional spin-orbit coupled systems

Details Electric-field induced spin excitations in two-dimensional spin-orbit coupled systems Electric-field induced spin excitations in two-dimensional spin-orbit coupled systems

2008-07-14

arxiv.org/abs/0807.2142v1

Physics

Condensed Matter

Materials Science

17 pages, 3 figures

Scientific paper

10.1103/PhysRevB.79.045317

Rigorous coupled spin-charge drift-diffusion equations are derived from quantum-kinetic equations for the spin-density matrix that incorporate effects due to k-linear spin-orbit interaction, an in-plane 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. This approach transfers methods known in the physics of space-charge waves to the treatment of spin eigenmodes. In addition, the amplification of an oscillating electric field by spin injection is demonstrated.

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