Spin-Orbit Interactions in Bilayer Exciton-Condensate Ferromagnets

TL;DR

This paper investigates how Rashba spin-orbit interactions influence magnetic anisotropies and quasiparticle spectra in bilayer exciton-condensate ferromagnets with unequal electron and hole densities.

Contribution

It demonstrates that Rashba spin-orbit interactions induce unconventional magnetic anisotropies and novel quasiparticle spectra in these systems.

Findings

Rashba spin-orbit interactions lead to magnetic anisotropies.

Unusual quasiparticle spectra emerge due to spin-orbit effects.

The strength of anisotropies is estimated.

Abstract

Bilayer electron-hole systems with unequal electron and hole densities are expected to have exciton condensate ground states with spontaneous spin-polarization in both conduction and valence bands. In the absence of spin-orbit and electron-hole exchange interactions there is no coupling between the spin-orientations in the two quantum wells. In this article we show that Rashba spin-orbit interactions lead to unconventional magnetic anisotropies, whose strength we estimate, and to ordered states with unusual quasiparticle spectra.