Abstract
Study is reported on the picosecond spectroscopy of relaxation processes in exciton systems in semiconductors by using a single-photon-counting set up developed by the authors. Excitonic emissions in ZnTe is the first topic, which show the dynamical aspect of the polaritons near the bottleneck. Time evolution of the resonance Raman processes are observable in real time in the polariton emissions. The second topic is excitonic magnetic polarons in Cd1-xMnxTe, where the dynamics of the spin-correlated excitons with Mn ions is discussed.
