Parametric excitation of a dc shuttle current via spontaneous symmetry breaking

TL;DR

This paper theoretically explores how parametric excitation in a symmetric shuttle system induces mechanical vibrations and a resulting dc current through spontaneous symmetry breaking, influenced by phase shifts and gate voltages.

Contribution

It demonstrates that parametric excitation near the eigenfrequency causes mechanical vibrations and dc current in a symmetric system, revealing the role of phase shifts and gate voltage dependence.

Findings

Parametric excitation induces mechanical vibrations near the eigenfrequency.

Mechanical vibrations lead to a dc shuttle current via spontaneous symmetry breaking.

The current direction depends on the phase shift between voltage and oscillations.

Abstract

We investigate theoretically the dynamics of a spatially symmetric shuttle-system subjected to an ac gate voltage. We demonstrate that in such a system parametric excitation gives rise to mechanical vibrations when the frequency of the ac signal is close to the eigenfrequency of the mechanical subsystem. These mechanical oscillations result in a dc shuttle current in a certain direction due to spontaneous symmetry breaking. The direction of the current is defined by the phase shift between the ac gate voltage and the parametrically excited mechanical oscillations. Dependance of the shuttle current on the dc gate voltage is also analyzed.