Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

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

TT 29.6: Talk

Wednesday, March 28, 2012, 16:15–16:30, H 2053

Understanding the Josephson current through Kondo-correlated quantum dots — •David J. Luitz¹, Fakher F. Assaad¹, Tomaš Novotný², and Volker Meden³ — ¹Institut für theoretische Physik und Astrophysik, Universität Würzburg, Germany — ²Department of Condensed Matter Physics, Charles University Prague, Czech Republic — ³Institut für Theorie der Statistischen Physik, RWTH Aachen, Germany

We study the Josephson current 0-π transition through correlated carbon-nanotube quantum dots tuned to the Kondo regime. The physics dominated by an interplay of two complex many-body effects, namely superconductivity and Kondo correlations, can be quantitatively captured by the numerically exact continuous time quantum Monte Carlo method within the single-impurity Anderson model with two superconducting leads. Comparison to existing experiments with the model parameters determined from the normal state linear conductance shows excellent agreement for the dependence of the critical Josephson current on the dot level position є experimentally tuned by the gate voltage.