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Excitons and phonons in Cu2O at high pressures

Excitons and phonons in Cu2O were studied by luminescence and Raman spectroscopy at hydrostatic pressures up to 8.5 GPa at a temperature of 6 K. From the linear blue shift of the exciton energies with pressure the authors deduce the pressure dependence of the band gap dEg/dp=12.5 meV GPa-1 and of the exciton Rydberg dR/dp=2.4 meV GPa-1. The Gruneisen parameters for the different phonons vary between +1.7 and -3.4.