The size of Cooper pairs is given by the trace of their quantum geometric quadrupole moment, with Berry curvature entering via the pair wavefunction phase to impose a geometric lower bound alongside the quantum metric.
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cond-mat.supr-con 2years
2026 2verdicts
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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.
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Quantum Geometric Quadrupole of Cooper Pairs
The size of Cooper pairs is given by the trace of their quantum geometric quadrupole moment, with Berry curvature entering via the pair wavefunction phase to impose a geometric lower bound alongside the quantum metric.
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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.