Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 33: TR: Nanoelectronics I: Quantum Dots, Wires, Point Contacts 2

TT 33.8: Talk

Thursday, March 25, 2010, 15:45–16:00, H19

Adiabatic pumping through a double quantum dot with Coulomb interaction — •Roman-Pascal Riwar and Janine Splettstoesser — Institut für Theoretische Physik A, RWTH Aachen University, D-52056 Aachen, Germany

We consider adiabatic pumping through a double quantum dot coupled to normal metal or ferromagnetic contacts by means of a real-time diagrammatic approach, performing a rigorous expansion in the weak coupling regime. The electrons in the serially aligned dots, which are subject to Coulomb repulsion, are pumped by alternating the left and right dot energy levels. In the case of weak inter-dot coupling we observe tunnel-induced renormalisation effects due to a coherent superposition of pseudospin states. Real spin effects are seen when arbitrarily polarised ferromagnets are attached to the double dot, where we investigate the limit of strong inter-dot coupling. In particular, we study the spin valve effect which can be reversed in the pumping current.