Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 28: Transport - Poster Session
TT 28.29: Poster
Donnerstag, 29. März 2007, 14:00–17:45, Poster A
Adiabatic pumping through a quantum dot in the proximity of a superconductor — Janine Splettstoesser1,2, •Michele Governale2, Jürgen König2, Fabio Taddei1, and Rosario Fazio1,3 — 1NEST-CNR-INFM & Scuola Normale Superiore, I-56126 Pisa, Italy — 2Institut für Theoretische Physik III, Ruhr-Universität Bochum, D-44780 Bochum, Germany — 3International School for Advanced Studies (SISSA), via Beirut 2-4, I-34014 Trieste, Italy
By varying periodically in time some properties of a mesoscopic conductor, a dc current can be produced by a transport mechanism known as pumping. We study adiabatic pumping through a quantum dot tunnel-coupled to one normal and one superconducting lead. We generalize a formula which relates the pumped charge through a quantum dot with Coulomb interaction to the instantaneous local Green’s function of the dot[1], to systems containing a superconducting lead. First, we apply this formula to the case of a non-interacting, single-level quantum dot in different temperature regimes and for different parameter choices, and we compare the results with the case of a system comprising only normal leads. Then we study the infinite-U Anderson model with a superconducting lead at zero temperature using the mean-field slave-boson approach, and we discuss the effect of the proximity of the superconductor on the pumped charge.
[1] J. Splettstoesser, M. Governale, J. König, and R. Fazio, Phys. Rev. Lett. 95, 246803 (2005).