Interplay of the Rashba and Dresselhaus spin-orbit coupling in the optical spin susceptibility of 2D electron systems

TL;DR

This paper investigates how Rashba and Dresselhaus spin-orbit interactions influence the optical spin susceptibility in 2D electron systems, revealing anisotropic spectral behaviors and resonances useful for probing spin phenomena.

Contribution

It provides the first detailed calculation of the frequency-dependent spin susceptibility tensor considering both Rashba and Dresselhaus couplings in 2D electron gases.

Findings

Anisotropic spectral behavior of spin density response due to combined spin-orbit interactions

Strong resonances in spin susceptibility linked to energy spin-splitting anisotropy

Potential for experimental probing of spin accumulation and currents

Abstract

We present calculations of the frequency-dependent spin susceptibility tensor of a two-dimensional electron gas with competing Rashba and Dresselhaus spin-orbit interaction. It is shown that the interplay between both types of spin-orbit coupling gives rise to an anisotropic spectral behavior of the spin density response function which is significantly different from that of vanishing Rashba or Dresselhaus case. Strong resonances are developed in the spin susceptibility as a consequence of the angular anisotropy of the energy spin-splitting. This characteristic optical modulable response may be useful to experimentally probe spin accumulation and spin density currents in such systems.