Effect of Coulomb interaction on the spin-galvanic mode in a two dimensional electron gas with Rashba spin-orbit interaction

TL;DR

This paper investigates how Coulomb interactions affect a newly predicted coupled charge-spin oscillation mode in a 2D electron gas with Rashba spin-orbit coupling, showing it significantly alters the mode's spectrum without suppressing it.

Contribution

It demonstrates that Coulomb interactions qualitatively change the spectrum of the spin-galvanic mode and proposes an experiment to detect it.

Findings

Coulomb interactions increase the mode's wavelength by orders of magnitude.

The mode persists despite Coulomb interaction modifications.

An experimental detection method is proposed.

Abstract

Recently a new propagating mode of coupled charge and spin oscillations was predicted in a two dimensional electron gas with a sufficiently strong Rashba interaction. We show that Coulomb interactions qualitatively modifies the spectrum and increases the characteristic wavelength of this mode by orders of magnitude, but does not suppress it. An absorption experiment that can conclusively detect the presence or absence of such a propagating mode is proposed.