Theory of Raman scattering by the plasma oscillations of a layered electron gas in semiconductor superlattices

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Abstract
Linear response techniques are used to calculate Green functions describing the plasmons in an infinitely extended superlattice composed of two-dimensional electron gas layers separated by an isotropic dielectric medium. Applications are made to inelastic light scattering from the plasmons, and the authors analyse the way in which the spectral lineshape and integrated intensity vary with the polarisation directions and the scattering geometry. Numerical results are obtained for GaAs/AlxGa1-xAs superlattices, allowing comparison with existing Raman scattering data. Predictions are made for further experimental studies.