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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology

Thursday, 06 November 2008
(at 16:20 in room main lecture hall of Leibniz Institute of Polymer Research Dresden)
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Magnetic N@C60 single-molecule transistors

Carsten Timm

Institute for Theoretical Physics
Dresden University of Technology

Recent experimental and theoretical results for single-molecule transistors involving endohedral N@60 fullerene molecules are reported. The observed differential conductance shows a low-spin/high-spin transition of the molecules for increasing magnetic field, a feature never seen in devices fabricated with pure C60. We explain the observations in terms of the exchange interaction between electrons in the fullerene LUMO and the nitrogen p-electrons. The observations support an antiferromagnetic interaction. In addition, very soft vibrational modes are seen. We discuss a model Hamiltonian that reproduces the main features of the experimental conductance. The theoretical description employs the master-equation formalism in the sequential-tunneling approximation. Rapid dephasing is assumed, which allows to reduce the master equation to a set of rate equations. A number of open questions and possible solutions are pointed out.

slides (pdf)

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