Abstract
The observation of both LO-phonon and inter-Landau-level magnetoplasmon shake-up excitations in the magnetophotoluminescence spectra of quantum wells containing high densities of free carriers is reported. The inter-Landau-level magnetoplasmon excitations occur at energies greater than the bare Landau-level separations, in agreement with the predictions of many-body theory. Clear evidence for LO-phonon--magnetoplasmon coupled-mode behavior is observed.
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