Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 88: Poster: Spintronics (HL jointly with MA, O)

O 88.7: Poster

Thursday, April 3, 2014, 17:00–20:00, P1

Magnetic susceptibility of 2 dimensional electron gases with Rashba spin-orbit coupling — •Christiane Scholl, Tobias Hartenstein, and Hans Christian Schneider — TU Kaiserslautern

The transverse spin-spin correlation, or dynamical magnetic susceptibility, is an important quantity both from the experimental and theoretcial point of view. It determines light-scattering and spin noise spectra, as well as the dispersions of elementary excitations of the magnetic type, such as magnons or magneto-magnons. Here, we consider a two-dimensional electron gas including Rashba spin-orbit coupling and Coulomb interaction. We use a decoupling scheme to derive the equations of motion for the relevant Green functions. Approximating the full Coulomb matrix element by a local interaction U, a closed expression for the dynamic transverse magnetic susceptibility results, which we analyze numerically. We find a complex interplay of internal effective Rashba fields with the external magnetic field. Further, the elementary "magnetic" excitations arise from resonances of the magnetic suscpetibility that are very different from plasmon resonances [1,2] with Rashba spin-orbit coupling or magneto-magnon [3] resonances.

[1] M. Pletyukhov, V. Gritsev, Phys. Rev. B 74, 045307 (2006).

[2] S. M. Badalyan, A. Matos-Abiague, G. Vignale, and J. Fabian, Phys. Rev. B 79, 205305 (2009.)

[3] D. M. Edwards, J. Phys. C. 2, 84 (1969).