Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 22: Transport: Molecular Electronics (jointly with CPP, HL, and MA)

MA 22.5: Vortrag

Mittwoch, 13. März 2013, 10:30–10:45, H2

Dynamics of a nano-scale rotor driven by single-electron tunneling — Alexander Croy² and •Alexander Eisfeld¹ — ¹MPIPKS 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