  We study theoretically and numerically the ground state of a gas of 2D
abelian anyons in an external trapping potential. We treat anyon statistics in
the magnetic gauge picture, perturbatively around the bosonic end. This leads
to a mean-field energy functional, whose ground state displays vortex lattices
similar to those found in rotating Bose-Einstein condensates. A crucial
difference is however that the vortex density is proportional to the underlying
matter density of the gas.
