EXCITONS AND BIEXCITONS IN CUCL NANOCRYSTALLITES

Because of the important binding energies of excitons and biexcitons i n CuCl, these elementary excitations can be treated in the weak confin ement regime if excited in semiconductor nanocrystallites. Their optic al properties and dynamics are similar to those of CuCl bulk material. Besides the well-known blue shift of resonances due to the confinemen t and their inhomogeneous broadening due to the size distribution of t he nanocrystallites, the main difference between both systems results from surface effects and the lack of translational invariance in nanoc rystallites. The latter affects the selection rules of optical transit ions and the exchange interaction of the quasiparticules.