Localized modes in nonlinear fractional systems with deep lattices

Abstract

Solitons in the fractional space, supported by lattice potentials, have recently attracted much interest. We consider the limit of deep one- and two-dimensional (1D and 2D) lattices in this system, featuring finite bandgaps separated by nearly flat Bloch bands. Such spectra are also a subject of great interest in current studies. The existence, shapes, and stability of various localized modes, including fundamental gap and vortex solitons, are investigated by means of numerical methods; some results are also obtained with the help of analytical approximations. In particular, the 1D and 2D gap solitons, belonging to the first and second finite bandgaps, are tightly confined around a single cell of the deep lattice. Vortex gap solitons are constructed as four-peak \textquotedblleft squares" and \textquotedblleft rhombuses" with imprinted winding number $S=1$. Stability of the solitons is explored by means of the linearization and verified by direct simulations.

14 pages, 6 figures, Advanced Theory and Simulations (In Press)

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• Optical soliton formation controlled by angle twisting in photonic moiré lattices
• Spatiotemporal accessible solitons in fractional dimensions
• Soliton dynamics in a fractional complex Ginzburg-Landau model
• The Two-Dimensional Fractional Discrete Nonlinear Schrodinger Equation
• Optical gap solitons and truncated nonlinear Bloch waves in temporal lattices
• Self-accelerating beam dynamics in the space fractional Schrödinger equation