Abstract
In crystals of the rocksalt structure the electro-optic coefficient as well as the first derivative of the electronic polarizability with respect to an ionic displacement vanishes because every ion is at a center of inversion. Consequently, the zone center optical phonons are inactive in first order Raman scattering. However, these phonons are infrared active, and the transverse optical (TO) phonons form polaritons when the retardation of the Coulomb interaction is taken into account. Because of the axial vector character of the magnetic field, the first derivative of the electronic polarizability with respect to the macroscopic magnetic field associated with the polaritons does not vanish in rocksalt type crystals. Thus the polaritons in crystals of the rocksalt structure can give rise to first order Raman scattering. In this note we present a theory of the Raman scattering intensity by polaritons via the magneto-optic effect, and estimate the intensity of the light scattered by this mechanism.
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