Modulation excitation spectroscopy: A method to determine the symmetry of electronic states

摘要

In this letter we present a new method to determine the character of the optical transitions. We apply this method to a single quantum well of GaAs/AlGaAs. We compare a conventional photoluminescence excitation (PLE) spectrum and a piezomodulated PLE spectrum. The observed relative intensity of the lighthyphen;hole and heavyhyphen;hole transitions is different in the former case than in the latter. This method allows us to assign the character of the optical transitions using only one measurement, and is very sensitive and selective.