In disordered NbN films, the superconductor-insulator transition is driven by quantum phase fluctuations: the superfluid stiffness drops sharply near critical disorder while the pairing temperature stays finite, and the finite-temperature transition remains of BKT type.
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Origin of the superconductor-insulator transition in disordered two-dimensional films
In disordered NbN films, the superconductor-insulator transition is driven by quantum phase fluctuations: the superfluid stiffness drops sharply near critical disorder while the pairing temperature stays finite, and the finite-temperature transition remains of BKT type.