Adiabatic N-soliton interactions of Bose-Einstein condensates in external potentials

Details Adiabatic N-soliton interactions of Bose-Einstein condensates in external potentials Adiabatic N-soliton interactions of Bose-Einstein condensates in external potentials

2005-12-10

arxiv.org/abs/cond-mat/0512218v1

Physics

Condensed Matter

Other Condensed Matter

13 pages, 8 figures, RevTeX

Scientific paper

10.1103/PhysRevE.73.046606

Perturbed version of the complex Toda chain (CTC) has been employed to describe adiabatic interactions within N-soliton train of the nonlinear Schrodinger equation (NLS). Perturbations induced by weak quadratic and periodic external potentials are studied by both analytical and numerical means. It is found that the perturbed CTC adequately models the N-soliton train dynamics for both types of potentials. As an application of the developed theory we consider the dynamics of a train of matter - wave solitons confined to a parabolic trap and optical lattice, as well as tilted periodic potentials. In the last case we demonstrate that there exist critical values of the strength of the linear potential for which one or more localized states can be extracted from a soliton train. An analytical expression for these critical strengths for expulsion is also derived.

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