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Inelastic Light Scattering by Elementary Excitations of the 2D Electron Gas at High Densities
Author(s) -
Goñi A. R.,
Danckwerts M.,
Haboeck U.,
Eberl K.,
Thomsen C.
Publication year - 1999
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199909)215:1<347::aid-pssb347>3.0.co;2-c
Subject(s) - fermi gas , electron density , electron , condensed matter physics , atomic physics , physics , photoluminescence , coulomb , inelastic scattering , population , scattering , optics , quantum mechanics , demography , sociology
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.