A Microscopic Lattice for Two-dimensional Dipolar Excitons

TL;DR

This paper demonstrates a two-dimensional lattice for dipolar excitons in GaAs quantum wells, showing control over exciton localization and narrow photoluminescence, paving the way for studying exciton quasi-condensation in periodic potentials.

Contribution

It introduces a novel 2D lattice platform for dipolar excitons, enabling exploration of localization effects and exciton condensation phenomena.

Findings

Lattice depth influences exciton localization.

Narrow-band photoluminescence observed at 340 mK.

Device suitable for exciton quasi-condensation studies.

Abstract

We report a two-dimensional artificial lattice for dipolar excitons confined in a GaAs double quantum well. Exploring the regime of large fillings per lattice site, we verify that the lattice depth competes with the magnitude of excitons repulsive dipolar interactions to control the degree of localisation in the lattice potential. Moreover, we show that dipolar excitons radiate a narrow-band photoluminescence, with a spectral width of a few hundreds of micro-eV at 340 mK, in both localised and delocalised regimes. This makes our device suitable for explorations of dipolar excitons quasi-condensation in a periodic potential.