  Chiral superconductors are expected to carry a spontaneous, chiral and
perpetual current along the sample edge. However, despite the availability of
several candidate materials, such a current has not been observed in
experiments. In this article, we suggest an alternative probe in the form of
impurity-induced chiral currents. We first demonstrate that a single
non-magnetic impurity induces an encircling chiral current. Its direction
depends on the chirality of the order parameter and the sign of the impurity
potential. Building on this observation, we consider the case of multiple
impurities, e.g., realized as adatoms deposited on the surface of a candidate
chiral superconductor. We contrast the response that is obtained in two cases:
(a) when the impurities are all identical in sign and (b) when the impurities
have mixed positive and negative signs. The former leads to coherent currents
within the sample, arising from the fusion of individual current loops. The
latter produces loops of random chirality that lead to incoherent local
currents. These two scenarios can be distinguished by measuring the induced
magnetic field using recent probes such as diamond NV centres. We argue that
impurity-induced currents may be easier to observe than edge currents, as they
can be tuned by varying impurity strength and concentration. We demonstrate
these results using a toy model for $p_x \pm i p_y$ superconductivity on a
square lattice. We develop an improved scheme for Bogoliubov deGennes (BdG)
simulations where both the order parameter as well as the magnetic field are
determined self-consistently.
