Mechanical feedback in the high-frequency limit

TL;DR

This paper explores the effects of strong mechanical feedback in a high-frequency single-electron tunneling device coupled to an underdamped oscillator, revealing that current noise remains at the Poisson level unlike low-frequency cases.

Contribution

It provides new insights into the high-frequency behavior of mechanical feedback in single-electron devices, contrasting with previous low-frequency studies.

Findings

Mechanical oscillations are driven by telegraph signals from the SET.

Current noise is not enhanced above the Poisson value in the high-frequency regime.

Strong feedback modifies the electric current without increasing noise beyond Poisson level.

Abstract

We investigate strong mechanical feedback for the single-electron tunneling device coupled to an underdamped harmonic oscillator in the high-frequency case, when the mechanical energy of the oscillator exceeds the tunnel rate, and for weak coupling. In the strong feedback regime, the mechanical oscillations oscillated by the telegraph signal from the SET in their turn modify the electric current. In contrast to the earlier results for the low frequencies, the current noise in not enhanced above the Poisson value.