Raman Scattering by Coupled Phonon-Plasmon Modes

The theory of Raman scattering by the electron-phonon coupled system in metals and heavily doped semiconductors is developed taking into account the Coulomb screening and the electron-phonon deformation interaction. The Boltzmann equation for carriers is applied. Phonon frequencies and optic coupling constants are renormalized due to interactions with carriers. The k-dependent semiclassical dielectric function is involved instead of the Lindhard-Mermin expression. The results of calculations are presented for various values of carrier concentration and electron-phonon coupling constant.