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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Two-photon coincidence statistics in terahertz light from a cavity-embedded 2H-NbSe2 superconductor provide a diagnostic for ultrastrong Higgs-polariton coupling that is missing in total photon counts.
In flat-band superconductors the pair size remains finite and set by the quantum metric while the coherence length diverges in the dilute limit and near insulating regimes.
A functional-integral derivation yields an effective thermodynamic potential that incorporates Gaussian order-parameter fluctuations and their coupling to static disorder near Tc across the BCS-BEC crossover.
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Self-consistent inclusion of disorder in the BCS-BEC crossover near the critical temperature
A functional-integral derivation yields an effective thermodynamic potential that incorporates Gaussian order-parameter fluctuations and their coupling to static disorder near Tc across the BCS-BEC crossover.