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TT: Tiefe Temperaturen

TT 8: Posters Transport

TT 8.27: Poster

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

Electronic Transport through C₆₀ — •Tobias Böhler, Jochen Grebing, 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 temperature the experiment shows evidence that the conductance of a single C₆₀ molecule between gold contacts is in the order of a tenth of G₀. This can be seen in opening and closing curves and also in time-dependent fluctuations of the conductance. However, the thermal fluctuations of the electrodes hamper the acquisition of meaningful current-voltage characteristics. Therefore we present an improved setup to measure the differential conductance at low temperatures.

[1] T. Böhler et al. Nanotechnology 15 (2004) 465