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.
