Topological versus conventional superconductivity in a Weyl semimetal: A microscopic approach

Starting from a microscopic model for the particle-particle interactions in a Weyl semimetal, we analyzed the

possibility for conventional as well as monopole Cooper pairing between quasiparticle excitations at the same

(intra-nodal) or opposite (inter-nodal) Weyl nodes. We derived a coupled system of self-consistent BCS-like

equations, where the angular dependence of the pairings is directly determined from the microscopic interaction

symmetries. We studied the competition between conventional and monopole superconducting phases, thus

obtaining explicitly the phase diagrams from the microscopic interaction model parameters. We determined the

critical temperatures for both phases, and the low temperature critical behavior, including the specific heat, that

we suggest as possible experimental probe for topological quantum criticality in Weyl semimetals