Kondo Force in Shuttling Devices: Dynamical Probe for a Kondo Cloud

TL;DR

This paper explores how Kondo tunneling in a nanoelectromechanical device enhances coupling and provides new insights into the Kondo cloud, enabling highly tunable dissipation and sensitive displacement detection.

Contribution

It demonstrates that Kondo effects significantly amplify NEM coupling and offer a novel method to probe the Kondo cloud through mechanical measurements.

Findings

Kondo tunneling exponentially amplifies NEM coupling.

The device's insensitivity to mesoscopic fluctuations.

Potential for superhigh tunability and supersensitive detection.

Abstract

We consider electromechanical properties of a single-electronic device consisting of movable quantum dot attached to a vibrating cantilever, forming a tunnel contact with a non-movable source electrode. We show that the resonance Kondo tunneling of electrons amplify exponentially the strength of nanoelectromechanical (NEM) coupling in such device and makes the latter to be insensitive to mesoscopic fluctuations of electronic levels in a nano-dot. It is also shown that the study of Kondo-NEM phenomenon provides an additional (as compared with a standard conductance measurements in a non-mechanical device) information on retardation effects in formation of many-particle cloud accompanied the Kondo tunneling. A possibility for superhigh tunability of mechanical dissipation as well as supersensitive detection of mechanical displacement is demonstrated.