Photoluminescence Spectroscopy of many-body Effects in Heavily Doped Al_xGa_1-xAs

2004/06/22 by Subhasis Ghosh, Ghosh, Subhasis, Niladri Sarkar +1
Physics and Astronomy · #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.mtrl-sci #cond-mat.str-el

paper · pdf · doi:10.48550/arxiv.cond-mat/0406507

arxiv created 2004/06/22 · arxiv updated 2009/12/01

Abstract

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_xGa_1-xAs 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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