  The physics of quantized vortex excitations in atomic Bose-Einstein
condensates has been extensively studied in recent years.Although simple vortex
lines are relatively easy to create, control, and measure in experiments, it is
a lot more difficult to do the same for vortex ring structures.Here we suggest
and explore a method for generating and controlling superfluid vortex rings,
vortex ring lattices, and other three dimensional vortex structures in
toroidally-trapped superfluid Bose--Einstein condensates by using the
artificial magnetic field produced by an optical nanofiber.The presence of the
fiber also necessitates a multiply-connected geometry and we show that in this
situation the presence of these vortex structures can be deduced from exciting
the scissors mode of the condensate.
