Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 8: Posters Transport

TT 8.25: Poster

Freitag, 4. März 2005, 14:00–18:00, Poster TU C

Theory for transport through a single magnetic molecule: endohedral N@C₆₀ — •Florian Elste and Carsten Timm — Institut für Theoretische Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany

We present a theory for transport through a single magnetic N@C60 molecule in a break junction, weakly coupled to the metallic leads. Since transport through a single C₆₀ molecule has been demonstrated and the synthesis of endohedral fullerenes is also feasible, such an experiment is possible with present-day technology. Employing a density-matrix formalism we derive rate equations for the occupation probabilities of the many-particle states of the molecule. We calculate the current-voltage characteristics and predict novel interesting structures in the differential conductance dI/dV, which are very different from what is seen for electrons coupled to molecular vibrations. Our results reveal Coulomb-blockade behavior as well as a fine structure of the Coulomb-blockade peaks in dI/dV due to the exchange coupling of the C₆₀ spin to the spin of the encapsulated nitrogen atom.