Time evolution of models described by one-dimensional discrete nonlinear Schrödinger equation

Details Time evolution of models described by one-dimensional discrete nonlinear Schrödinger equation Time evolution of models described by one-dimensional discrete nonlinear Schrödinger equation

1996-04-08

arxiv.org/abs/cond-mat/9604055v1

Physics

Condensed Matter

16 pages, REVTEX, 9 figures available upon request, To appear in Physical Review B

Scientific paper

10.1103/PhysRevB.53.14929

The dynamics of models described by a one-dimensional discrete nonlinear Schr\"odinger equation is studied. The nonlinearity in these models appears due to the coupling of the electronic motion to optical oscillators which are treated in adiabatic approximation. First, various sizes of nonlinear cluster embedded in an infinite linear chain are considered. The initial excitation is applied either at the end-site or at the middle-site of the cluster. In both the cases we obtain two kinds of transition: (i) a cluster-trapping transition and (ii) a self-trapping transition. The dynamics of the quasiparticle with the end-site initial excitation are found to exhibit, (i) a sharp self-trapping transition, (ii) an amplitude-transition in the site-probabilities and (iii) propagating soliton-like waves in large clusters. Ballistic propagation is observed in random nonlinear systems. The effect of nonlinear impurities on the superdiffusive behavior of random-dimer model is also studied.

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