In time-reversal symmetric s-wave superfluids with an isolated flat band, pairing and density fluctuations hybridize into a single gapless mode whose quadratic dispersion coefficients are set by the normal-state quantum metric.
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Interplay between Quantum Metric and Hybridized Collective Mode in Flat-Band Superfluids
In time-reversal symmetric s-wave superfluids with an isolated flat band, pairing and density fluctuations hybridize into a single gapless mode whose quadratic dispersion coefficients are set by the normal-state quantum metric.