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.
@article{arxiv.cond-mat/0310290,
title = {Excitonic Mott transition in double quantum wells},
author = {V. V. Nikolaev and M. E. Portnoi},
journal= {arXiv preprint arXiv:cond-mat/0310290},
year = {2009}
}