Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 35: Spin controlled transport II
HL 35.11: Vortrag
Mittwoch, 27. Februar 2008, 17:00–17:15, ER 164
Spin-orbit interaction induced anisotropy of the plasmon spectrum — •Samvel Badalyan1,2, Alex Matos-Abiague2, Giovanni Vignale3, and Jaroslav Fabian2 — 1Department of Radiophysics, Yerevan State University, 375025 Yerevan, Armenia — 2Department of Physics, University of Regensburg, 93040 Regensburg, Germany — 3Department of Physics and Astronomy, University of Missouri - Columbia, Missouri 65211, USA
We have investigated the combined effect of the Rashba and Dresselhaus spin-orbit interaction on the many-body Coulomb interaction in a two-dimensional electron system (2DES). It is shown that the many-body polarization function is strongly anisotropic both in the static and dynamic limits. The dielectric function of a 2DES has been calculated within the random phase approximation and the plasmon energy as a function of the momentum magnitude for its different orientations has been obtained. We have also calculated the dynamical structure factor and have shown its peaked behavior as a function of the polar angle of plasmon momentum. This peak corresponds to the plasmon with finite damping due to the spin-orbit interaction. Thus, we have demonstrated clearly that due to the anisotropy of the spin-orbit interaction, the plasmons with the definite values of energy and momentum can be excited only in the certain direction corresponding to the polar angle, determined from the plasmon spectrum.
This work is supported by the Volkswagen Foundation, the DFG Grant Sonderforschungsbereich 689, and NSF Grant No. DMR-0313681.