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bcs theory 1berry phase 1correlation effects 1many-body currents 1superconductivity 1

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cond-mat.supr-con2026

Geometric origin of supercurrents in Berry phase: Formula for computing currents from wavefunctions with correlation and particle number variation

B. Q. Song, J. D. H. Smith, J. Wang

The paper presents a phase‑based formula that computes supercurrents directly from microscopic BCS wavefunctions, incorporating Berry‑phase derived group velocity and a correlation…