Dresden 2009 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 10: Superconductivity: Tunneling, Josephson Junctions, SQUIDs

TT 10.9: Talk

Monday, March 23, 2009, 16:15–16:30, HSZ 105

Conductance of an array of Josephson junctions in the insulating state — •Sergey Syzranov¹, Konstantin Efetov¹, and Boris Altshuler² — ¹Theoretische Physik III, Ruhr-Universität Bochum, 44801 Bochum, Germany — ²Physics Department, Columbia University, New York, N.Y. 10027, USA

We study transport in weakly disordered two-dimensional arrays of Josephson junctions in the Coulomb blockade regime. We calculate the conductance of the system at low temperatures and show that it has an activation behaviour with the activation gap close to the charging energy of a single Cooper pair on a superconducting island between the junctions. While a disordered array has a finite conductivity, the conductance of an ideally regular array is independent of its size. The possibility of a new ``superinsulating'' state is discussed.