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- W2078585979 abstract "Many-body effects of two-dimensional electrons in n-type modulation-doped ${mathrm{Al}}_{mathit{x}}$${mathrm{Ga}}_{1mathrm{ensuremath{-}}mathit{x}}$As/GaAs heterostructures have been studied by photoluminescence (PL), PL excitation (PLE) spectroscopy, and optically detected cyclotron resonance (ODCR). A Fermi-edge singularity (FES) is observed both in PL and PLE spectra when a gate voltage is applied. Strong enhancements occur for electrons at the Fermi edge (${mathit{E}}_{mathit{F}}$) recombining both with holes bound at acceptors and holes at the GaAs valence-band edge. These assignments are supported by the spectral behavior of the ODCR signals. Our results show that the FES in optical spectra due to holes in the GaAs valence band is correlated in strength with the FES corresponding to holes bound at acceptors. The strong Fermi-edge enhancement in optical spectra in our structures is due to the presence of an unoccupied adjacent second electron subband near the Fermi edge." @default.
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- W2078585979 date "1992-08-15" @default.
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- W2078585979 title "Optical investigation of Fermi-edge singularities inAl0.35Ga0.65As/GaAs heterostructures" @default.
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- W2078585979 doi "https://doi.org/10.1103/physrevb.46.4352" @default.
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