Single-pole magnet emerges in frozen concoction
Experiment simulates long-sought magnetic particle
NORTH POLE An artificial monopole (left), whose magnetic field spreads away in all directions, came from researchers’ manipulation of an ultracold gas. In a traditional bar magnet (right), the magnetic field juts out from the north pole and bends toward the south pole.
M. Atarod, adapted from M.W. Ray et al/Nature 2014