Real-Space Tailoring of the Electron-Phonon Coupling in Ultra-Clean Nanotube Mechanical Resonators

TL;DR

This paper demonstrates the ability to tailor and control electron-phonon interactions in ultra-clean carbon nanotube resonators, enabling direct imaging of phonon modes and selective mode coupling at the nanoscale.

Contribution

It introduces a method to tune electron-phonon coupling in nanotube devices, allowing for spatial imaging and mode selectivity, advancing quantum control in nanosystems.

Findings

Successful spatial imaging of phonon modes.

Demonstration of selective coupling between mechanical modes and electronic states.

Control over electron-phonon interactions at the quantum level.

Abstract

The coupling between electrons and phonons is at the heart of many fundamental phenomena in physics. In nature, this coupling is generally predetermined for both, molecules and solids. Tremendous advances have been made in controlling electrons and phonons in engineered nanosystems, yet, control over the coupling between these degrees of freedom is still widely lacking. Here, we use a new generation of carbon nanotube devices with movable ultra-clean single and double quantum dots embedded in a mechanical resonator to demonstrate the tailoring of the interactions between electronic and mechanical degrees of freedom on the nanoscale. Exploiting this tunable coupling, we directly image the spatial structure of phonon modes and probe their parity in real space. Most interestingly, we demonstrate selective coupling between individual mechanical modes and internal electronic degrees of freedom. Our results open new vistas for engineering bulk quantum phenomena in a controlled nanoscale setting and offer important new tools for entangling the electronic and mechanical degrees of freedom at the quantum level.