Plasmon spectrum of two-dimensional electron systems with Rashba spin-orbit interaction
Abstract
The dielectric function and plasmon modes of a two-dimensional electron gas (2DEG) are studied in single- and double-quantum-well structures with Rashba spin-orbit interaction (RSOI) in the framework of the random-phase approximation. The RSOI splits each parabolic energy subband of a 2DEG into two nonparabolic spin branches and affects the electronic many-body correlation and dielectric properties of the 2DEG. The influence of the RSOI on the 2DEG plasmon spectrum in single quantum wells appear mainly in three ways: 1) an overall frequency lowering due to the energy band deformation; 2) a weak frequency oscillation stemming from the spin-split energy band; and 3)an enhancement of the Landau damping as a result of the emerging of the inter-branch single-particle-excitation spectrum. In double quantum wells, the above effects are enhanced for the optic plasmon mode but diminished for the acoustic one.
Cite
@article{arxiv.cond-mat/0510243,
title = {Plasmon spectrum of two-dimensional electron systems with Rashba spin-orbit interaction},
author = {X. F. Wang},
journal= {arXiv preprint arXiv:cond-mat/0510243},
year = {2009}
}
Comments
7 figures