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Theory of Raman scattering by plasmon-polaritons in semiconductor superlattices

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JournalJournal of physics c-Solid state physics
DatePublished - 10 Oct 1987
Issue number28
Volume20
Number of pages16
Pages (from-to)4597-4612
Original languageEnglish

Abstract

A theory of light scattering by superlattice plasmon-polaritons is developed using linear response techniques. The general polariton Green functions are adapted to the case of plasmon-polaritons in GaAs/AlxGa1-xAs superlattices, and these are used to calculate the light scattering cross section. The fully retarded theory yields mode frequencies, spectral lineshapes, polarisation selection rules and integrated intensities of the high-frequency transverse magnetic and transverse electric modes, as well as the low-frequency transverse magnetic modes. The nonretarded limit is appropriate for the description of the low-frequency modes, which have been investigated in recent Raman experiments, and the theory simplifies in this case. Numerical examples of GaAs/AlxGa1-xAs superlattices are given. Comparison is made with the available experimental data and further experimental work is suggested.

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