Nonlinear Schrödinger lattices II: Persistence and Stability of Discrete Vortices

D. E. Pelinovsky; P. G. Kevrekidis; D. J. Frantzeskakis

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arXiv · nlin/0411016

Nonlinear Schrödinger lattices II: Persistence and Stability of Discrete Vortices

D. E. Pelinovsky·P. G. Kevrekidis·D. J. Frantzeskakis

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Abstract

We study discrete vortices in the anti-continuum limit of the discrete two-dimensional nonlinear Schr{ö}dinger (NLS) equations. The discrete vortices in the anti-continuum limit represent a finite set of excited nodes on a closed discrete contour with a non-zero topological charge. Using the Lyapunov-Schmidt reductions, we find sufficient conditions for continuation and termination of the discrete vortices for a small coupling constant in the discrete NLS lattice. An example of a closed discrete contour is considered that includes the vortex cell (also known as the off-site vortex). We classify the symmetric and asymmetric discrete vortices that bifurcate from the anti-continuum limit. We predict analytically and confirm numerically the number of unstable eigenvalues associated with various families of such discrete vortices.

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D. E. Pelinovsky, P. G. Kevrekidis, D. J. Frantzeskakis. 2004-11-06. Nonlinear Schrödinger lattices II: Persistence and Stability of Discrete Vortices. https://arxiv.org/abs/nlin/0411016

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