Competing instabilities of the Kitaev-Kondo Model

We investigate the leading instabilities of the Kitaev-Kondo model using perturbative renormalization group (RG) analysis. In this model, the Kitaev quantum spin liquid on the honeycomb lattice is coupled to conduction electrons via Kondo coupling. We recast the local moments of the Kitaev model as Majorana fermions and derive an effective low energy field theory to study the phase transition from the fractionalized Fermi liquid (FL*) to the ordered phase. It has been conjectured that the Kondo coupling between conduction elections to gapless Majorana fermions could lead to novel superconductivity phase. However our results do not support this claim and instead showed more conventional conduction electron instabilities.