The ultrastrong coupling of single-electron tunneling and nanomechanical motion opens exciting opportunities to explore fundamental questions and develop new platforms for quantum technologies. We have measured and modeled this electromechanical coupling in a fully-suspended carbon nanotube device and report a ratio of gm/ωm=2.72±0.14, where gm/2π=0.80±0.04 GHz is the coupling strength and ωm/2π=294.5 MHz is the mechanical resonance frequency. This is well within the ultrastrong coupling regime and the highest among all other electromechanical platforms. We show that, although this regime was present in similar fully-suspended carbon nanotube devices, it went unnoticed. Even higher ratios could be achieved with improvement on device design.
@article{arxiv.2103.15219,
title = {Ultrastrong coupling between electron tunneling and mechanical motion},
author = {Florian Vigneau and Juliette Monsel and Jorge Tabanera and Kushagra Aggarwal and Léa Bresque and Federico Fedele and G. A. D Briggs and Janet Anders and Juan M. R. Parrondo and Alexia Auffèves and Natalia Ares},
journal= {arXiv preprint arXiv:2103.15219},
year = {2022}
}
Comments
13 pages, 11 figures This new version contains the same model and analysis but applied to new experimental data compared to the previous version. This is why the coupling ratio is now 2.72 instead of 1.3 and most of the experimental parameters have changed