Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 45: Correlated Electrons: Poster Session
TT 45.14: Poster
Donnerstag, 29. März 2012, 15:00–19:00, Poster B
Mechanism for Giant Thermopower in negative-U Molecular Quantum Dots — •Theo Costi1, Sabine Andergassen2, and Veljko Zlatic3 — 1Peter Grünberg Institut (PGI-2) and Institute for Advanced Simulation (IAS-3), Forschungszentrum Jülich, 52425 Jülich, Germany — 2Institut für Theorie der Statistischen Physik, RWTH Aachen, 59056 Aachen, Germany and JARA-Fundamentals for Information Technology — 3Institute of Physics, 10001 Zagreb, Croatia
We investigate with the aid of numerical renormalization group techniques the thermoelectric properties of a molecular quantum dot described by the negative-U Anderson model. We show that the charge Kondo effect provides a mechanism for enhanced thermoelectric power via a correlation induced asymmetry in the spectral function close to the Fermi level.
We show that this effect results in a dramatic enhancement of the Kondo induced peak in the thermopower of negative-U systems with Seebeck coefficients exceeding 50µ V/K over a wide range of gate voltages [1].
S. Andergassen, T. A. Costi and V. Zlatić, Phys. Rev. B (arXiv:1101.4124)