  Magnetic reconnection is prevalent in magnetized plasmas in space and
laboratories. Despite significant investigations on reconnection in
electron-ion plasmas, studies of reconnection in magnetized plasmas with
negatively charged dust grains are quite sparse. Here we report the first fully
kinetic simulations of collisionless reconnection in a three-species (i.e.,
electron, proton, and negatively charged dust grain) dusty plasma, through
which the discovery of double Hall pattern is made. The double Hall pattern
consists of a traditional Hall quadruple current in between the ion and
electron diffusion region, and a reversed Hall current in between the boundary
of the ion and dust diffusion region. The analysis of the reconnection rate is
also given. This study may be applicable to explain observations of planetary
magnetospheres and the astrophysical objects, and may be realized in the
laboratory studies of dusty plasmas.
