CPM Seminar

Electrical transport and infinite randomness at the superconductor-metal transition

Adrian Del Maestro

Department of Physics
University of British Columbia

The influence of quenched disorder on the superconductor-metal transition, as described by a theory of overdamped Cooper pairs which repel each other is considered. The self-consistent pairing eigenmodes of a quasi-one dimensional wire are determined numerically at zero temperature. The results strongly support the proposal by Hoyos et al. [Phys. Rev. Lett. 99, 230601 (2007)] that the transition is characterized by the same infinite randomness fixed point describing the onset of ferromagnetism in the random quantum Ising chain in a transverse field. Using the Kubo formula, we evaluate the zero-temperature AC conductivity near the transition and find agreement with an analytical strong disorder scaling function.