Effects of distance dependence of exciton hopping on the Davydov soliton

Details Effects of distance dependence of exciton hopping on the Davydov soliton Effects of distance dependence of exciton hopping on the Davydov soliton

1995-03-24

arxiv.org/abs/cond-mat/9503131v1

Physics Letters A 204 (1995) 263-268

Physics

Condensed Matter

RevTeX 13 pages, 3 Postscript figures

Scientific paper

10.1016/0375-9601(95)00481-H

The Davydov model of energy transfer in molecular chains is reconsidered assuming the distance dependence of the exciton hopping term. New equations of motion for phonons and excitons are derived within the coherent state approximation. Solving these nonlinear equations result in the existence of Davydov-like solitons. In the case of a dilatational soliton, the amplitude and width is decreased as a results of the mechanism introduced here and above a critical coupling strength our equations do not allow for localized solutions. For compressional solitons, stability is increased.

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