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Regensburg 2013 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 21: Transport: Molecular Electronics (joint session TT/CPP/HL/MA)

CPP 21.5: Talk

Wednesday, March 13, 2013, 10:30–10:45, H2

Dynamics of a nano-scale rotor driven by single-electron tunnelingAlexander Croy2 and •Alexander Eisfeld11MPIPKS Dresden — 2Chalmers University of Technology S-412 96 Göteborg, Sweden

We investigate theoretically the dynamics and the charge transport properties of a rod-shaped nano-scale rotor, which is driven by a similar mechanism as the nanomechanical single-electron transistor (NEMSET). We show that a static electric potential gradient can lead to self-excitation of oscillatory or continuous rotational motion. We identify the relevant parameters of the device and study the dependence of the dynamics on these parameters. We discuss how the dynamics are related to the measured current through the device. Notably, in the oscillatory regime we find a negative differential conductance. The current-voltage characteristics can be used to infer details of the surrounding environment which is responsible for damping.
[1] A. Croy and A. Eisfeld, EPL (Europhys Lett) 98, 68004

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