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.
citing papers explorer
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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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Ultrastrong Coupling Signatures in Photon Statistics from Terahertz Higgs-Polaritons
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.
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Correlation lengths of flat-band superconductivity from quantum geometry
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.