Universal thermal and electrical transport near the superconductor-metal quantum phase transition in nanowires

摘要

We describe the thermal and electrical conductivities of quasi-onedimensional wires, across a quantum phase transition from a superconductor to ametal induced by pairbreaking perturbations. Fluctuation corrections to BCStheory motivate a field theory for quantum criticality. We describe deviationsin the Wiedemann-Franz ratio from the Lorenz number, which can act as sensitivetests of the theory. We also describe the crossovers out of the quantumcritical region into the metallic and superconducting phases.