  The vortex-vortex interaction in two-component Bose-Einstein condensates is
shown to present characteristic effects not possible in single-component
condensates. In particular, vortices in different components undergo separate,
but concentric, orbits for both same and opposite circulation. In addition,
contrary to the well-known behavior in single-component condensates, vortices
with the same circulation created in the less dense component merge in the
presence of dissipation, allowing for the creation of metastable vortices with
more than one quantum of circulation.
