Soliton Gyroscopes in Media with Spatially Growing Repulsive Nonlinearity
Soliton Gyroscopes in Media with Spatially Growing Repulsive Nonlinearity
We find that the recently introduced model of self-trapping supported by a spatially growing strength of a repulsive nonlinearity gives rise to robust vortex-soliton tori, i.e., three-dimensional vortex solitons, with topological charges $S\ensuremath{\ge}1$. The family with $S=1$ is completely stable, while the one with $S=2$ has alternating regions of stability …