Bose-Einstein statistics of orthoexcitons generated by two-photon resonant absorption in cuprous oxide

Abstract

Excitation by two-photon resonant absorption may be able to maintain the temperature of the orthoexcitonic system in ${\mathrm{Cu}}_{2}$O sufficiently low, resulting in an excitonic density high enough to allow us to study the quantum Bose-Einstein statistical properties of a nearly ideal Bose gas. The luminescence spectra show that the orthoexcitonic system consists of two parts. One follows the usual Bose-Einstein statistics with chemical potential \ensuremath{\mu}=0. The other is at an energy position corresponding to zero kinetic energy.