From spatially indirect to momentum-space indirect exciton by in-plane magnetic field

TL;DR

This paper demonstrates how an in-plane magnetic field can significantly alter the photoluminescence and exciton dispersion in coupled quantum wells, enabling control over exciton states in momentum space.

Contribution

It introduces the use of in-plane magnetic fields to engineer exciton dispersion and induce a transition from direct to indirect exciton states in momentum space.

Findings

In-plane magnetic field drastically changes photoluminescence spectra.

Magnetic field induces a transition from direct to indirect exciton ground state.

Exciton dispersion can be effectively engineered using magnetic fields.

Abstract

In-plane magnetic field is found to change drastically the photoluminescence spectra and kinetics of interwell excitons in GaAs/AlGaAs coupled quantum wells. The effect is due to the in-plane magnetic field induced displacement of the interwell exciton dispersion in a momentum space, which results in the transition from the momentum-space direct exciton ground state to the momentum-space indirect exciton ground state. In-plane magnetic field is, therefore, an effective tool for the exciton dispersion engineering.