Dynamical conductivity at the dirty superconductor-metal quantum phase transition

Details Dynamical conductivity at the dirty superconductor-metal quantum phase transition Dynamical conductivity at the dirty superconductor-metal quantum phase transition

2010-06-18

arxiv.org/abs/1006.3793v2

Phys. Rev. Lett. 105, 145702 (2010)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 2 figures; (v2) minor typos corrected, published version

Scientific paper

10.1103/PhysRevLett.105.145702

We study the transport properties of ultrathin disordered nanowires in the neighborhood of the superconductor-metal quantum phase transition. To this end we combine numerical calculations with analytical strong-disorder renormalization group results. The quantum critical conductivity at zero temperature diverges logarithmically as a function of frequency. In the metallic phase, it obeys activated scaling associated with an infinite-randomness quantum critical point. We extend the scaling theory to higher dimensions and discuss implications for experiments.

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