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Mechanism for large thermoelectric power in molecular quantum dots described by the negative-U Anderson model

S. Andergassen, T. A. Costi, and V. Zlatić
Phys. Rev. B 84, 241107(R) – Published 13 December 2011

Abstract

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 50 μV/K over a wide range of gate voltages.

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  • Received 19 January 2011

DOI:https://doi.org/10.1103/PhysRevB.84.241107

©2011 American Physical Society

Authors & Affiliations

S. Andergassen1, T. A. Costi2, and V. Zlatić2,3,4

  • 1Institut für Theorie der Statistischen Physik, RWTH Aachen University and JARA-Fundamentals of Information Technology, D-52056 Aachen, Germany
  • 2Peter Grünberg Institut and Institute for Advanced Simulation, Research Centre Jülich, D-52425 Jülich, Germany
  • 3Institute of Physics, HR-10001 Zagreb, Croatia
  • 4J. Stefan Institute, SI-1000 Ljubljana, Slovenia

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Issue

Vol. 84, Iss. 24 — 15 December 2011

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