Dynamics of a nanoscale rotor driven by single-electron tunneling

¹ Max-Planck-Institute for the Physics of Complex Systems - Nöthnitzer Str. 38, 01187 Dresden, Germany, EU
² Department of Applied Physics, Chalmers University of Technology - 41296 Göteborg, Sweden, EU
³ Department of Chemistry and Chemical Biology, Harvard University - 12 Oxford Street, Cambridge, MA 02138, USA

^a alexander.croy@chalmers.se
^b eisfeld@pks.mpg.de

Received: 3 January 2012
Accepted: 23 May 2012

Abstract

We investigate theoretically the dynamics and the charge transport properties of a rod-shaped nanoscale 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.