title: Split instability of a vortex in an attractive Bose-Einstein condensate.
abstract: An attractive Bose-Einstein condensate with a vortex splits into two pieces via the quadrupole dynamical instability, which arises at a weaker strength of interaction than the monopole and the dipole instabilities. The split pieces subsequently unite to restore the original vortex or collapse.
authors.affiliation: Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Saito
authors.forename: Masahito
authors.initials: M
authors.lastname: Ueda