Exciton condensation in quantum wells. Exciton hydrodynamics. The effect of localized states

TL;DR

This paper develops hydrodynamic equations for indirect excitons in double quantum wells, exploring phase formation, density distributions, and the influence of localized states on emission spectra.

Contribution

It introduces a comprehensive hydrodynamic model accounting for exciton condensation, pumping, finite lifetime, and defect scattering, analyzing localized and free states effects.

Findings

Threshold pumping induces periodic exciton density patterns.

Localized states significantly influence emission spectra.

Exciton condensed phase formation is theoretically demonstrated.

Abstract

The hydrodynamic equations for indirect excitons in the double quantum wells are studied taking into account 1) a possibility of an exciton condensed phase formation, 2) the presence of pumping, 3) finite value of the exciton lifetime, 4) exciton scattering by defects. The threshold pumping emergence of the periodical exciton density distribution is found. The role of localized and free exciton states is analyzed in the formation of emission spectra.