Abstract:

We describe the thermal and electrical conductivites of quasi-one dimensional

wires across a quantum phase transition between a superconductor and metal

driven by pairbreaking perturbations. Fluctuation corrections to BCS theory

motivate a field theory for quantum criticality. In the quantum critical

region we can compute deviations in the Wiedemann-Franz ratio from the Lorenz

number which will act as a sensitive test of the theory. Time permitting, the

connection of the critical theory to a recently proposed infinite randomness

fixed point will be discussed.

Department of Physics