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Exchange enhancements of the spin-polarized 2D electron gas are determined for the first time by inelastic light scattering from spin-flip inter-Landau-level and intersubband excitations. In the magnetic quantum limit {ν}=1 the splitting between long wavelength magnetoplasmons and spin-flip inter-Landau-level excitations is a direct spectroscopic measurement of the enhanced exchange energy. At {ν}=1 the enhancements in GaAs quantum wells are in agreement with the Hartree-Fock approximation.
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Pinczuk et al. (1992) studied this question.
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