Photoluminescence Spectroscopy of many-body Effects in Heavily Doped Al$_x$Ga$_{1-x}$As

Details Photoluminescence Spectroscopy of many-body Effects in Heavily Doped Al$_x$Ga$_{1-x}$As Photoluminescence Spectroscopy of many-body Effects in Heavily Doped Al$_x$Ga$_{1-x}$As

2004-06-22

arxiv.org/abs/cond-mat/0406507v1

Physics

Condensed Matter

Materials Science

Scientific paper

We present an experimental investigation of heavy doping-induced many-body effects such as band gap narrowing(BGN) and Fermi edge singularity(FES) in Al$_x$Ga$_{1-x}$As using photoluminescence(PL) spectroscopy. The band-to-band transition energy shifts to lower energies and FES-like feature in PL spectra grows with increasing electron concentration. We show that FES-like 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-like feature in the PL spectra.

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