Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 38: Poster Session Transport

TT 38.6: Poster

Wednesday, March 16, 2011, 14:00–18:00, P3

Josephson current through interacting quantum dots — •Stephanie Droste, Janine Splettstoesser, and Sabine Andergassen — Institut für Theorie der Statistischen Physik RWTH Aachen & JARA-Fit, Germany

Motivated by recent experiments on transport through carbon nanotube double dots with superconducting leads, we study the effects of Coulomb interactions on transport through such a device. Richer physics due to the proximity effect is expected, as a consequence of the more complex level structure and differing interaction strengths between different dot levels. We extend a recent analysis [1] of Coulomb interaction effects in a single-level quantum dot to a serial double dot coupled to superconducting leads. We derive a local effective Hamiltonian including the atomic or molecular levels as well as the induced proximity effect on the quantum dot and compute the Josephson current as well as a Δ-dependent phase diagram. The effective Hamiltonian is the starting point of a detailed analysis of dissipative effects.
T. Meng et al., Phys. Rev. B 79, 224521 (2009).