Nonlinear paraexciton kinetics in a potential trap in Cu2O under two-photon resonance excitation - art. no. 245203

摘要

The nonlinear kinetics of paraexcitons confined in a harmonic trap in Cu2O is examined by analyzing emission spectra under two-photon excitation of orthoexcitons as a function of the excitation power density. Strong saturation has been observed in paraexciton density without saturation of orthoexciton density. This indicates the occurrence of two-body collision that works as evaporative cooling process in the trap. We also show evidence for the direct creation of cold paraexcitons by a two-photon resonance excitation. [References: 12]