We investigate the energetics of the electron-hole liquid in stoichiometric divalent metal hexaborides. The ground state energy of an electron-hole plasma is calculated using RPA and Hubbard schemes and compared to the binding energy of a single exciton. Intervalley scattering processes play an important role in increasing this binding energy and stabilizing a dilute Bose gas of excitons.
@article{arxiv.cond-mat/9910272,
title = {Electron-hole liquid in the hexaborides},
author = {M. E. Zhitomirsky and T. M. Rice},
journal= {arXiv preprint arXiv:cond-mat/9910272},
year = {2009}
}