Localized Modes in Nonlinear Fractional Systems with Deep Lattices

Solitons in the fractional space, supported by lattice potentials, have recently attracted much interest. The limit of deep 1D and 2D lattices in this system is considered, 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 squares and rhombuses with imprinted winding number S=1. Stability of the solitons is explored by means of the linearization and verified by direct simulations.

Automated summary

This study investigates the existence, shapes, and stability of solitons supported by lattice potentials in fractional space. Numerical methods and analytical approximations are employed to obtain various results, including the construction of 1D and 2D gap solitons and the verification of stability for vortex solitons.