Multi-flavor topological Kondo effect

The topological Kondo model does not have a perturbative intermediate fixed point when the lead fermions are weakly interacting. We introduce a modified physically motivated Hamiltonian by adding Ν flavors to the topological Kondo model. We calculate the perturbative renormalization group equations  and consider the large-Ν limit of the β functions. In the isotropic limit, we find an intermediate stable fixed point, which can be brought to weak coupling in the large-N limit. We investigate the effects of weak anisotropy and the stability of the strong coupling fixed point to complete the flow diagram for the  coupling constants. We calculate the temperature- and voltage-dependence of the conductance matrix to obtain experimentally observable signatures of our results.