Abstract
The temporal and spatial dispersions of the permittivity of complex oxide crystals, which have numerous branches of dipole active oscillations, is considered. Formulas for calculating the susceptibility spectra of complex oxides in the terahertz region with allowance for both types of dispersion are obtained in the resonance approximation of photon-phonon interaction using quantum Green’s functions. The calculation results are used to discuss the well-known experimental data.
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