Abstract
Localization of lattice vibrations is investigated for a soft zone-center optic mode overlapping the acoustic spectrum of an anharmonic one-dimensional diatomic lattice. An intrinsic resonant mode is found below the plane-wave optic spectrum. Using numerical methods the frequency and eigenvector of the intrinsic resonant mode has been measured as a function of its amplitude and the optic-mode frequency. Molecular-dynamics simulations show that these localized modes are stable.
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