Excitonic Mott transition in double quantum wells

TL;DR

This paper theoretically investigates the excitonic Mott transition in double quantum wells, revealing abrupt changes in ionization degree with temperature and density, and predicting an anomalous transition under specific conditions.

Contribution

It introduces a theoretical analysis of the excitonic Mott transition in double quantum wells, highlighting new phenomena like the anomalous Mott transition and ionization behavior.

Findings

Abrupt jump in ionization degree with increasing density or temperature

Collapse of electron-hole plasma into exciton system at lower densities

Prediction of a sharp decrease in ionization degree with temperature increase

Abstract

We consider an electron-hole system in double quantum wells theoretically. We demonstrate that there is a temperature interval over which an abrupt jump in the value of the ionization degree occurs with an increase of the carrier density or temperature. The opposite effect - the collapse of the ionized electron-hole plasma into an insulating exciton system - should occur at lower densities. In addition, we predict that under certain conditions there will be a sharp decrease of the ionization degree with increasing temperature - the anomalous Mott transition. We discuss how these effects could be observed experimentally.