Giant Magneto-Oscillations of Electric-Field-Induced Spin Polarization in 2DEG

TL;DR

This paper predicts giant oscillations in electric-field-induced spin polarization in a disordered 2D electron gas with spin-orbit coupling under strong magnetic fields, due to electron-hole asymmetry effects.

Contribution

It introduces a theoretical analysis showing that magnetic fields cause large oscillations in spin polarization, a novel effect in 2DEG systems with spin-orbit coupling.

Findings

Spin polarization oscillates with magnetic field strength.

Oscillation amplitude exceeds zero-field polarization.

Electron-hole asymmetry drives the oscillations.

Abstract

We consider a disordered two-dimensional electron gas with spin-orbit coupling placed in a perpendicular magnetic field and calculate the magnitude and direction of the electric-field-induced spin polarization. We find that in strong magnetic fields the polarization becomes an oscillatory function of the magnetic field and that the amplitude of these oscillations is parametrically larger than the polarization at zero magnetic field. We show that the enhanced amplitude of the polarization is a consequence of strong electron-hole asymmetry in a quantizing magnetic field.