Static solitary excitations in a two-dimensional diatomic lattice are studied in detail. The authors' model uses a local anharmonic electron-ion coupling for the polarisability of the anion and harmonic couplings between different chains. This lattice may serve as a model for certain ferro-electric materials. Solitary finite-energy excitations are found and proved to be stable.
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Behnke et al. (1981) studied this question.
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