Regensburg 2007 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 18: Nanoelectronics I - Quantum Dots, Wires, Point Contacts
TT 18.6: Talk
Wednesday, March 28, 2007, 15:15–15:30, H19
Adiabatic pumping through interacting quantum dots: A perturbation expansion in the tunnel coupling — •Janine Splettstoesser1,2, Michele Governale2, Jürgen König2, and Rosario Fazio1,3 — 1Scuola Normale Superiore, Pisa, Italy — 2Theoretische Physik III, Ruhr-Universität Bochum, Germany — 3SISSA, Trieste, Italy
We present a diagrammatic real-time approach [1,2] to adiabatic pumping of electrons through interacting quantum dots. Performing a systematic perturbation expansion in the tunnel-coupling strength, we compute the charge pumped through a single-level quantum dot per pumping cycle.
The combination of Coulomb interaction and quantum fluctuations, accounted for
in contributions of higher order in the tunnel coupling, modifies the pumping
characteristics via an interaction-dependent renormalization of the quantum-dot level. The latter is even responsible for the dominant contribution to the
pumped charge when pumping via time-dependent tunnel-coupling strengths.[3]
[1] J. König, H. Schoeller, and G. Schön, Phys. Rev. Lett.76, 1715 (1996).
[2] J. König, J. Schmid, H. Schoeller, and G. Schön, Phys. Rev. B 54, 16820 (1996).
[3] J. Splettstoesser, M. Governale, J. König, R. Fazio, Phys. Rev. B 74, 085305 (2006).