Abstract
We have investigated the dependence on carrier density of elementary excitations of the 2D electron gas formed in a modulation-doped single quantum well structure. The 2D electron density n, as obtained from lineshape fits to the photoluminescence spectra, is continuously increased by applying dc voltages ranging from 5 to 100 V between the electron gas and a back contact. A substantial population of the second electron subband is revealed at high voltages by the strong redshift of the corresponding emission line due to bandgap renormalization effects. In this high-density regime, we observe a large reduction of the exchange-correlation term of the Coulomb interaction.
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