Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 28: Transport - Poster Session
TT 28.9: Poster
Donnerstag, 29. März 2007, 14:00–17:45, Poster A
Electronic Transport through C60 — Tobias Böhler, •Achim Edtbauer, and Elke Scheer — FB Physik - Universität Konstanz
The electronic transport through a single or a few C60 molecules is studied experimentally with the help of the mechanically controllable break-junction (MCB) technique [1]. The tip electrodes of the MCB are fabricated of aluminum or gold. The molecule is evaporated onto an opened break-junction under UHV conditions and at low temperatures. At room and low temperature the experiment shows evidence that the conductance of a single C60 molecule between gold contacts is in the order of 0,1 G0. This can be seen in opening and closing curves, by statistical analysis (conductance histograms) and by the presence of time-dependent fluctuations of the conductance. The differential conductance of individual contacts measured - for those values of conductance which in the statistical measurements have shown to be the preferred ones - reveal fluctuations on the voltage scale of several mV. We discuss the typical behavior of the different conductance regimes. Only for very few contacts the differential conductance indicates the excitation of vibrational modes. [1] T. Böhler et al. Nanotechnology 15 (2004) 465