Abstract
We present an experimental investigation of heavy doping-induced many-body effects such as band gap narrowing and Fermi-edge singularity (FES) in ${\mathrm{Al}}_{x}{\mathrm{Ga}}_{1\ensuremath{-}x}\mathrm{As}$ using photoluminescence (PL) spectroscopy. The band-to-band transition energy shifts to lower energies and the FES feature in PL spectra grows with increasing electron concentration. We show that the FES feature is a nonmonotonic function of temperature and excitation intensity. Our data lead us to suggest that a small concentration of nonequilibrated holes is required to enhance the FES feature in the PL spectra.
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