Abstract
We have examined the role of long-range Coulomb forces in the phonon spectrum of a system of two ionic, interpenetrating sublattices. We find that the Coulomb forces create a gap in the sliding mode in the case of incommensurate sublattices while they enlarge the existing gap in the case of commensurate sublattices. The dielectric properties of a system of incommensurate lattices are also examined. Connection with experiment is discussed.
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