We study thermodynamic properties of spatially separated electron-hole plasma in double-layered systems using Green function formalism. The screening of the Coulomb interaction is considered in the framework of Thomas-Fermi approximation, and a qualitatively new mechanism of screening by indirect excitons is taken into account. The exciton density is shown to decrease sharply with increasing electron-hole separation up to one exciton Born radius. The strong mutual enhancement of screening and charge-separation effects is found.
@article{arxiv.cond-mat/0111384,
title = {Statistical mechanics of screened spatially indirect excitons},
author = {V. V. Nikolaev and M. E. Portnoi},
journal= {arXiv preprint arXiv:cond-mat/0111384},
year = {2015}
}