Observation of Time Evolution from Resonant Raman Scattering to Excitonic-Polariton Luminescence in ZnTe

Abstract
We report the evolution from resonant Raman scattering (RS) due to longitudinal-optical and acoustic phonons to excitonic-polariton luminescence in ZnTe at low temperature by picosecond time-resolved spectroscopy. The resonant RS lines deform with decay time of 300 ps into the ordinary polariton luminescence. The finite decay time of the RS lines shows evidence of a real transition on the polariton branch in the resonant RS process.