Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 29: TR: Nanoelectronics I: Quantum Dots, Wires, Point Contacts 1

TT 29.10: Vortrag

Donnerstag, 25. März 2010, 12:00–12:15, H19

Thermolelectric transport through strongly correlated quantum dots — •Theo Costi¹ and Veljko Zlatić^1,2 — ¹Institut für Festkörperforschung and Institute for Advanced Simulation (IAS), Forschungszentrum Jülich, 52428 Jülich, Germany — ²Institute of Physics, 10001 Zagreb, Croatia

We use the numerical renormalization group method to calculate thermoelectric transport through a strongly correlated quantum dot described by a single level Anderson impurity model attached to non-interacting leads[1]. We compare and contrast the results with the well known ones for the case of dilute magnetic impurities in non-magnetic metals. In the Kondo regime, we find significant differences in the height of the "charge-fluctuation" peak of the thermopower for these two different situations. The thermal conductivity for the quantum dot exhibits a richer behaviour than for the case of magnetic impurities. We discuss favourable conditions of gate voltage and temperature for achieving a large figure of merit for quantum dot systems.

[1] T. A. Costi and V. Zlatić, preprint (2009).