title: Creating vortex rings and three-dimensional skyrmions in Bose-Eeinstein condensates.
abstract: We propose a method of generating a vortex ring in a Bose-Einstein condensate by means of electromagnetically induced atomic transitions. Some remnant population of atoms in a second internal state remains within the toroidal trap formed by the mean-field repulsion of the vortex ring. This population can be removed, or it can be made to flow around the torus (i.e., within the vortex ring). If this flow has a unit topological winding number, the entire structure formed by the two condensates is an example of a three-dimensional Skyrmion texture.
authors.affiliation: Department of Physical Sciences, University of Hertfordshire, Hatfield, Herts AL10 9AB, United Kingdom.
authors.forename: J
authors.initials: J
authors.lastname: Ruostekoski
authors.forename: J R
authors.initials: JR
authors.lastname: Anglin