Journal Article

PreJuSER-18530

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Mechanism for large thermoelectric power in molecular quantum dots described by the negative-U Anderson model

Andergassen, S. ; Costi, T. A.FZJ* ; Zlatic, V.FZJ*

2011
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/20503  doi:10.1103/PhysRevB.84.241107

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 mu V/K over a wide range of gate voltages.

Keyword(s): J

Note: We acknowledge supercomputer support by the John von Neumann Institute for Computing (Julich), discussions with C. Karrasch and V. Meden (S. A.), and support by NSF Grant DMR-1006605, Forschungszentrum Julich, and the Ministry of Science, Croatia (V.Z.).

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Contributing Institute(s):

1. Theoretische Nanoelektronik (PGI-2)
2. Theoretische Nanoelektronik (IAS-3)
3. JARA - HPC (JARA-HPC)

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (P42)
2. Thermoelectric properties of self-assembled quantum dots and oxide heterostructure interfaces (jiff23_20100501) (jiff23_20100501)

Appears in the scientific report 2011

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