Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 98: Transport: Nanomechanics

TT 98.2: Vortrag

Donnerstag, 3. April 2014, 15:15–15:30, BEY 81

Nano-scale rotor driven by single-electron tunneling — •Alan Celestino¹, Alexander Croy², Marcus Werner Beims³, and Alexander Eisfeld¹ — ¹MPIPKS, Dresden, Germany — ²Chalmers University of Technology S-412 96, Göteborg, Sweden — ³Federal University of Paraná, Curitiba, Brazil

We study theoretically the dynamics and the electronic transport in a nano-scale rotor. The rotor is driven by electron tunneling in the Coulomb-blockade regime. We show that a static bias can lead to self-excitation of intermittent oscillatory/rotatory or continuous rotational motion. We establish the connection between the dynamical regimes and the current through the device. The relevant device’s parameters are identified and we study the dynamics’ dependence on these parameters. Notably, in the intermittent 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. Finally, we show how to break the system’s symmetry in order to recast it as a rectifier.
A. Croy and A. Eisfeld, EPL 98, 68004