Abstract

High density electrons and holes at low temperature in direct-gap semiconductor show collective quantum mechanical effects such as the formation of electron-hole liquid and exciton condensation. In the usual band to band excitation, the initial temperature of the carriers remains high within their lifetime. However, creating electron-hole pairs via exciton Mott transition can reduce the initial temperature and CuCl is a good system to realize such a transition, because of its large (213 meV) Is Z₃ exciton binding energy. Recently we have reported on the observation of broad band emission at 100 meV below the exciton band for resonant exciton excitation in CuCl as shown in Fig. 1[1]. However, the origin of the broad band emission and its temporal evolution is yet to be understood.

© 2000 IEEE