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- W2088952203 abstract "A generalized model for the nonlinear transport of vibrational energy in a molecular chain is derived. It contains the coupling to both the optical and the acoustic modes of the lattice. The model reduces in simplified situations to the Davydov model or the Holstein model. Reductions to two forms of discrete nonlinear Schrodinger equations are discussed, and the corresponding solitary wave solutions are presented. In general, the molecular chain contains some randomness, which is caused by different physical mechanisms: (i) randomly distributed molecules around the chain, (ii) different masses of the side groups, and (iii) random distributions of the intermolecular distances. The various effects are discussed, and special attention is given to their influences on the transmission coefficient. Besides Anderson localization in the (nearly) linear regime, it is found that solitonlike waves can be excited, which may lead to an anomalous nonlinear convective transport of vibrational energy. This is a very important effect in a random molecular chain." @default.
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- W2088952203 date "1993-04-01" @default.
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- W2088952203 title "Nonlinear transport of vibrational energy in a random molecular chain" @default.
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- W2088952203 doi "https://doi.org/10.1103/physrevb.47.7827" @default.
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