2007/08/05 by Adrian Del Maestro, Adrian del Maestro, Bernd Rosenow +2 · 2 citations
Physics and Astronomy · #Condensed matter physics #Criticality #Nanowire #Nuclear physics #Phase transition #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum and electron transport phenomena #Quantum critical point #Quantum mechanics #Quantum phase transition #Sigma #Superconductivity #Superconductivity in MgB2 and Alloys #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.77.180501
published as Physical Review B 77, 180501 (2008) · 4 pages, 1 figure
arxiv created 2007/08/05 · openalex publication_date 2008/05/02 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We describe the thermal (\ensuremathκ) and electrical (\ensuremathσ) conductivities of quasi-one-dimensional wires, across a quantum phase transition from a superconductor to a metal induced by pair-breaking perturbations. Fluctuation corrections to BCS theory motivate a field theory for quantum criticality. We describe deviations in the Wiedemann-Franz ratio \ensuremathκ∕\ensuremathσT (where T is the temperature) from the Lorenz number (\ensuremathπ2∕3)(kB∕e)2, 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.