Dipolar bright solitons and solitary vortices in a radial lattice

Abstract

Stabilizing vortex solitons with high values of the topological charge, S, is a challenging issue in optics, studies of Bose-Einstein condensates (BECs) and other fields. To develop a new approach to the solution of this problem, we consider a two-dimensional dipolar BEC under the action of an axisymmetric radially periodic lattice potential, $V(r)\sim \cos (2r+\delta )$, with dipole moments polarized perpendicular to the system's plane, which gives rise to isotropic repulsive dipole-dipole interactions (DDIs). Two radial lattices are considered, with $\delta =0$ and $\pi$, i.e., a potential maximum or minimum at $r=0$, respectively. Families of vortex gapsoliton (GSs) with $S=1$ and $S\ge 2$, the latter ones often being unstable in other settings, are completely stable in the present system (at least, up to $S=11$), being trapped in different annular troughs of the radial potential. The vortex solitons with different $S$ may stably coexist in sufficiently far separated troughs. Fundamental GSs, with $S=0$, are found too. In the case of $\delta =0$, the fundamental solitons are ring-shaped modes, with a local minimum at $r=0.$At $\delta =\pi$, they place a density peak at the center.

10 pages, 10 figures and 86 references; Physical Review A, in press

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Cited by in corpus (3)

• Vortex-ring quantum droplets in a radially-periodic potential
• Two-dimensional quantum droplets in binary quadrupolar condensates
• Tightly bound solitons and vortices in three-dimensional bosonic condensates with the electromagnetically-induced gravity