We present a detailed theoretical analysis of light-absorption and luminescence of bulk semiconductors at finite electron-hole densities and temperatures. The analysis is carried out within a real-time Green’s-function formalism with self-energies evaluated in the self-consistent T-matrix approximation. The theory is applied to a two-band model of GaAs, for which the single-particle self-energies and spectral functions and the absorption and luminescence spectra are calculated. The effects of excitonic correlations on these quantities are highlighted.

• Received 4 December 2008

DOI:https://doi.org/10.1103/PhysRevB.79.155205