A repulsive Hubbard term selects topologically nontrivial pairing over the trivial one in singular-interaction superconductors, with the transition passing through a topology-induced time-reversal symmetry breaking phase.
As it flips both ωand Im(∆), a vortex on the left side of the causal plane becomes a vortex on the right side
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Topologically non-trivial gap function and topology-induced time-reversal symmetry breaking in a superconductor with singular dynamical interaction
A repulsive Hubbard term selects topologically nontrivial pairing over the trivial one in singular-interaction superconductors, with the transition passing through a topology-induced time-reversal symmetry breaking phase.