Field-induced spin excitations in Rashba-Dresselhaus two-dimensional electron systems probed by surface acoustic waves

TL;DR

This paper investigates how a constant in-plane electric field affects spin excitations in Rashba-Dresselhaus two-dimensional electron systems, using surface acoustic waves to probe resonant modes and identify magnetization resonances.

Contribution

It introduces a novel method employing surface acoustic waves to study field-induced spin excitations in spin-orbit coupled 2D electron systems, revealing resonant behaviors.

Findings

Identification of sharp resonances in magnetization due to electric field

Demonstration of surface acoustic waves as probes for spin excitations

Insights into the robustness of persistent spin helix under external fields

Abstract

A spin-rotation symmetry in spin-orbit coupled two-dimensional electron systems gives rise to a long-lived spin excitation that is robust against short-range impurity scattering. The influence of a constant in-plane electric field on this persistent spin helix is studied. To probe the field-induced eigen-modes of the spin-charge coupled system, a surface acoustic wave is exploited that provides the wave-vector for resonant excitation. The approach takes advantage of methods worked out in the field of space-charge waves. Sharp resonances in the field dependence of the in-plane and out-of-plane magnetization are identified.