Orateur
Description
The superconductor-to-insulator transition (SIT) originates from the competition between Anderson localization, which tends to localize single-particle wavefunctions, and superconductivity, which establishes long-range correlations in the superconducting order parameter. The evolution of the sheet resistance and the superfluid stiffness is monitored in a wide range of disorder strength.
We establish that even up to disorder values near the quantum-critical point, the finite-temperature transition from the superconducting into the resistive state remains of BKT type. When disorder approaches the critical value, the zero temperature stiffness is witnessed to vanish rapidly, while the order parameter remains finite, pointing towards quantum fluctuations of the superconducting phase driving the zero-temperature transition.