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TT: Fachverband Tiefe Temperaturen

TT 14: Transport: Nanoelectronics III - Molecular Electronics

TT 14.5: Talk

Tuesday, February 26, 2008, 10:30–10:45, H 3010

Modeling of tunneling through single endohedral N@C₆₀ molecules — •Carsten Timm¹, Jacob E. Grose², Wolfgang Harneit³, and Daniel C. Ralph² — ¹University of Kansas, Lawrence, USA — ²Cornell University, Ithaca, USA — ³Freie Universität Berlin, Germany

We report on recent experimental and theoretical results for single-molecule transistors involving endohedral N@C₆₀ fullerene molecules. In this talk, we will focus on the theoretical modeling. The observed differential conductance shows strong evidence for the exchange interaction between electrons in the fullerene LUMO and the nitrogen p-electrons, favoring an antiferromagnetic interaction. In addition, soft vibrational modes are seen, which are attributed to oscillations of the molecule as a whole. We discuss a model Hamiltonian that reproduces the main features of the experimental conductance.