Universal thermal and electrical transport near the superconductor-metal quantum phase transition in nanowires
arXiv:0708.0687 · doi:10.1103/PhysRevB.77.180501
Abstract
We describe the thermal and electrical conductivities of quasi-one dimensional wires, across a quantum phase transition from a superconductor to a metal induced by pairbreaking perturbations. Fluctuation corrections to BCS theory motivate a field theory for quantum criticality. We describe deviations in the Wiedemann-Franz ratio from the Lorenz number, which can act as sensitive tests of the theory. We also describe the crossovers out of the quantum critical region into the metallic and superconducting phases.
4 pages, 1 figure
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- Dynamical conductivity at the dirty superconductor-metal quantum phase transition
- Theory of the pairbreaking superconductor-metal transition in nanowires