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Article
Discrete Solitons and Vortices in Anisotropic Hexagonal and Honeycomb Lattices
Journal of Optics
  • Q E Hoq, Western New England University
  • Panayotis G. Kevrekidis, University of Massachusetts Amherst
  • A R Bishop, Los Alamos National Laboratory
Publication Date
2016
Abstract

In the present work, we consider the self-focusing discrete nonlinear Schrödinger equation on hexagonal and honeycomb lattice geometries. Our emphasis is on the study of the effects of anisotropy, motivated by the tunability afforded in recent optical and atomic physics experiments. We find that multi-soliton and discrete vortex states undergo destabilizing bifurcations as the relevant anisotropy control parameter is varied. We quantify these bifurcations by means of explicit analytical calculations of the solutions, as well as of their spectral linearization eigenvalues. Finally, we corroborate the relevant stability picture through direct numerical computations. In the latter, we observe the prototypical manifestation of these instabilities to be the spontaneous rearrangement of the solution, for larger values of the coupling, into localized waveforms typically centered over fewer sites than the original unstable structure. For weak coupling, the instability appears to result in a robust breathing of the relevant waveforms.

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Arxiv prepritn uploaded. doi:10.1088/2040-8978/18/2/024008

Pages
024008 (23pp)
Citation Information
Q E Hoq, Panayotis G. Kevrekidis and A R Bishop. "Discrete Solitons and Vortices in Anisotropic Hexagonal and Honeycomb Lattices" Journal of Optics Vol. 18 Iss. 024008 (2016)
Available at: http://works.bepress.com/panos_kevrekidis/371/