Time-reversal symmetry broken superconductors admit a type II Lifshitz invariant that renders the Higgs mode optically active in conductivity spectra, with a full classification of allowed magnetic point group corepresentations.
Schmid, The approach to equilibrium in a pure su- perconductor the relaxation of the Cooper pair density, Phys
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Type II Lifshitz invariant and optically active Higgs mode in time-reversal symmetry broken superconductors
Time-reversal symmetry broken superconductors admit a type II Lifshitz invariant that renders the Higgs mode optically active in conductivity spectra, with a full classification of allowed magnetic point group corepresentations.