Excitonic polariton structures in Wurtzite GaN

Abstract

Reflectance, photoreflectance and photoluminescence spectra of GaN substrate prepared by lateral epitaxial overgrowth technique were measured at low temperature. All spectra were discussed based on model exciton-polariton picture, and the spectra were successfully explained by the model. Temperature dependence of transition energies was well described using a model that assume Einstein phonons.