title: Stable stationary and quasiperiodic discrete vortex breathers with topological charge S = 2.
abstract: We demonstrate the stability of a stationary vortex breather with vorticity S = 2 in the two-dimensional discrete nonlinear Schrödinger model for a square lattice and also discuss the effects of exciting internal sites in a vortex ring. We also point out the fundamental difficulties of observing these solutions with current experimental techniques. Instead, we argue that relevant initial conditions will lead to the formation of quasiperiodic vortex breathers.
authors.affiliation: Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden. micos@ifm.liu.se
authors.forename: Michael
authors.initials: M
authors.lastname: Oster
authors.forename: Magnus
authors.initials: M
authors.lastname: Johansson