Super-long life time for 2D cyclotron spin-flip excitons

TL;DR

This paper reports an experimental technique to manipulate and detect entangled electron spins in 2D magnetoexcitons, revealing extremely slow spin relaxation times exceeding 100 microseconds in high mobility GaAs/AlGaAs quantum Hall systems.

Contribution

It introduces a novel experimental approach for studying spin dynamics in 2D magnetoexcitons and provides the first observation of super-long spin relaxation times in these systems.

Findings

Spin relaxation times exceed 100 microseconds in certain quantum Hall systems

Spin relaxation exhibits specific temperature and magnetic field dependencies

Qualitative explanation of relaxation kinetics is provided

Abstract

An experimental technique for the indirect manipulation and detection of electron spins entangled in two-dimensional magnetoexcitons has been developed. The kinetics of the spin relaxation has been investigated. Photoexcited spin-magnetoexcitons were found to exhibit extremely slow relaxation in specific quantum Hall systems, fabricated in high mobility GaAs/AlGaAs structures, namely, the relaxation time reaches values over one hundred microseconds. A qualitative explanation of this spin-relaxation kinetics is presented. Its temperature and magnetic field dependencies are discussed within the available theoretical framework.