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Experimental results on the absolute magneto-transmission of a series of highdensity, high mobility GaAs quantum wells are compared with the predictions ofa recent magnetoplasmon theory for values of the filling factor above 2. Weshow that the magnetoplasmon picture can explain the non-linear featuresobserved in the magnetic field evolution of the cyclotron resonance energiesand of the absorption oscillator strength. This provides experimental evidencethat inter Landau level excitations probed by infrared spectroscopy need to beconsidered as many body excitations in terms of magnetoplasmons: this isespecially true when interpreting the oscillator strengths of the cyclotrontransitions

Evidence for magnetoplasmon character of the cyclotron resonance response of a two-dimensional electron gas