Plasmonic and shallow donor excitations in n-type GaAs are studied in extreme magnetic-fields (up to 28T) using the method of inelastic light scattering (Raman scattering). [1] The strength of magnetic field was sufficient to made cyclotron frequency comparable to all important frequencies in the system, namely the plasma frequency, and the frequencies of longitudinal (LO) and transverse (TO) optical phonons. The physics of mixed plasma and phonon excitations under these particular and interesting conditions has never been fully explored in Raman scattering experiments.

Experimental data are analyzed using a standard, dielectric function theory. Results obtained for samples with high electron concentration are well understood in terms of observation of longitudinal, plasmon-phonon excitations. A strong interaction of coupled LO-phonon-plasmon modes with the collective cyclotron resonance excitations (Bernstein modes) is observed.

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