Soliton States in a Chain with Two Atoms in a Unit Cell
The soliton mechanism of the energy transport, suggested by Davydov and Kislukha1, was further developed and applied to the wide variety of phenomena in physics and biology2, 3. The mechanism is based on the model of ID chain with an extra quasiparticle (exciton, electron or hole), interacting with longitudinal displacements of atoms. Real systems differ from this model first of all by a complicated structure, and in their spectra there are various branches of vibrations. Naturally the following questions arise: i) why the Davydov model takes into account the interaction with acoustical phonons only, and to what extent this model is applicable to real systems, and ii) is the Davydov soliton stable under the interaction with other vibrational modes.
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