LINEAR AND NONLINEAR EXCITONIC ABSORPTION AND PHOTOLUMINESCENCE SPECTRA IN CU2O - LINE-SHAPE ANALYSIS AND EXCITON DRIFT

A complete analysis of the line shape of the excitonic absorption and photoluminescence lines of the yellow series of Cu2O is given. A detai led fit to the absorption lines up to the n = 5 exciton according to T oyozawa's theory gives precise values for the excitonic resonance ener gies, allowing to calculate the excitonic Rydberg. The fit to the phot oluminescence lines shows very good agreement with experimental data a t different temperatures, At high excitation, the fit to the excitonic absorption lines reveals the fundamental mechanism for bleaching of e xciton absorption lines in Cu2O. Based on these findings, a new all-op tical method for the observation of exciton transport in Cu2O is propo sed.