Photoluminescence spectra measured on a type-II GaSb/GaAs quantum dot ensemble at high excitation power indicate a Mott transition from the low density state comprising of spatially-indirect excitons to a high density electron-plasma state. Under the influence of a very high magnetic field, the electron-plasma that is formed at high excitation powers is `frozen-out' into a state of optically inactive magneto-excitons.
@article{arxiv.0706.1972,
title = {Excitonic Mott transition in type-II quantum dots},
author = {Bhavtosh Bansal and M. Hayne and M. Geller and D. Bimberg and V. V. Moshchalkov},
journal= {arXiv preprint arXiv:0706.1972},
year = {2009}
}