Abstract
We have observed the energy distribution of nonthermalized excitons in the semiconductor Cu2O on a time scale of 10 ps following near-resonant creation by a short (5ps) laser pulse. We see a non-Maxwellian energy distribution with four discrenible hot-luminescence peaks at early times due to emission of both acoustic and optic phonons, which had previously been identified as multi-phonon Raman scattering lines. We fit the energy distribution of the excitons at all times by numerically integrating an exact Boltzmann equation. From this we deduce the deformation potential for acoustic phonon emission, which agrees with the results of hydrostatic-stress and uniaxial-stress measurements, and we deduce the rate for single optic phonon emission, which turns out to be rather slow, about 30 ps.
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