Probing two-subband systems in a quantizing magnetic field with non-equilibrium phonons

TL;DR

This paper proposes using phonon absorption spectroscopy to investigate many-body gaps and phases in two-subband quantum Hall systems, considering the effects of spin-orbit interaction on phonon absorption.

Contribution

It introduces a novel spectroscopic approach to study complex quantum Hall systems and analyzes the influence of spin-orbit coupling on phonon interactions.

Findings

Phonon absorption can reveal many-body gaps.

Spin-orbit interaction affects phonon absorption spectra.

Method provides insights into quantum Hall phases.

Abstract

We propose to use phonon absorption spectroscopy to study many-body gaps and phases of two-subband heterostructures in the quantum Hall regime. Implications of the spin-orbit interaction for phonon absorption in this system are considered.