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cond-mat.supr-con2025
Gauge-invariant electromagnetic responses in superconductors
Sena Watanabe, Haruki Watanabe
Gauge invariance is essential for making physically meaningful predictions. In superconductors, mean-field Hamiltonians that explicitly break symmetry often yield gauge-depe…
cond-mat.supr-con2024
A gauge-invariant formulation of optical responses in superconductors
Sena Watanabe, Haruki Watanabe
Superconductors are often discussed in the mean-field approximation that breaks symmetry. Since the symmetry underlies the charge conservation, naive application of r…