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TT: Fachverband Tiefe Temperaturen

TT 16: TR: Nanoelectronics III - Molecular Electronics 1

TT 16.6: Talk

Monday, March 14, 2011, 19:30–19:45, HSZ 03

Statistical analysis of the thermopower of metallic atomic contacts — •Fabian Pauly¹, Juan Carlos Cuevas², Markus Dreher³, Peter Nielaba³, and Janne K. Viljas⁴ — ¹Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology — ²Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid — ³Fachbereich Physik, University of Konstanz — ⁴Low Temperature Laboratory, Aalto University

We study theoretically the thermopower of Ag, Au, and Pt nanocontacts [1]. In our work, we employ classical molecular dynamics simulations to obtain structures during wire stretching and a tight-binding model for electric transport calculations. We find good agreement with experiment [2] for the evolution of the thermopower with increasing electrode separation and also the therompower histograms. The comparison between the monovalent metals (Ag, Au) shows qualitative differences to those for multivalent ones (Pt).
F. Pauly, J.C. Cuevas, M. Dreher, P. Nielaba, J.K. Viljas (in preparation)
B. Ludoph and J. M. van Ruitenbeek, Phys. Rev. B 59, 12290 (1999)