Formation of k-space indirect magnetoexcitons in double-quantum-well direct gap heterostructures

TL;DR

This paper investigates how tilted magnetic fields affect exciton spectra in double-quantum-well heterostructures, revealing a transition from direct to indirect excitons in k-space and associated photoluminescence quenching.

Contribution

It provides a theoretical analysis of the formation of k-space indirect magnetoexcitons under tilted magnetic fields in double-quantum-well structures.

Findings

Spectrum becomes asymmetric with nonzero transverse magnetic field component.

Transition from k-space direct to indirect exciton occurs with photoluminescence quenching.

Abstract

Spectrum of excitons in double-quantum-well structures is calculated in tilted magnetic field. It is shown that spectrum becomes asymmetric in quasimomentum if a transverse in respect to growth direction component of magnetic field is nonzero. A transition from $k$-space direct exciton ground state to $k$-space indirect one accompanied by sharp quenching of photoluminescense is described.