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.
Silaev, Nonlinear electromagnetic response and Higgs-mode excitation in BCS superconductors with im- purities, 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.