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TT: Fachverband Tiefe Temperaturen

TT 29: Superconductivity: Tunnelling, Josephson Junctions, SQUIDs 1

TT 29.2: Vortrag

Mittwoch, 28. März 2012, 15:15–15:30, H 2053

Current-voltage dependence of a one-dimensional Josephson junction array in the Coulomb blockade regime — •Nicolas Vogt¹, Alexander Shnirman^1,2, and Alexey V. Ustinov^3,2 — ¹Institut für Theorie der Kondensierten Materie, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany — ²DFG-Center for Functional Nanostructures (CFN) , Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany — ³Physikalisches Institus, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany

We theoretically investigate the transport characteristics of a one-dimensional Josephson junction array in the Cooper pair Coulomb blockade regime. Explanations for the hysteresis in the current-voltage characteristics and threshold voltage have been previously proposed within the mean field sine-Gordon model. This approach fails, however, to explain the recent experimental data. Experiments show a quadratic dependence of the differential conductance on the Josephson coupling energy which depends on the magnetic field. We introduce various models of dissipation into the mean field theory in order to numerically simulate the time resolved behavior of the voltage biased array.