Microwave-optical spectroscopy of Rydberg excitons in the ultrastrong driving regime

Brewin, Alistair; Gallagher, Liam A P; Pritchett, Jonathan D; Wong, Horatio Q X; Potvliege, Robert M; Clark, Stewart J; Jones, Matthew P A

Abstract

We study the ultrastrong driving of Rydberg excitons in Cu2O by a microwave field. The effect of the field is studied using optical absorption spectroscopy, and through the observation of sidebands on the transmitted laser light. A model based on Floquet theory is constructed to study the system beyond the rotating wave approximation. We obtain near quantitative agreement between theory and experiment across a 16-fold range of microwave field strengths spanning from the perturbative to the deep strong driving regime. Compared to Rydberg atoms, the large non-radiative widths of Rydberg excitons leads to new behaviour such as the emergence of an absorption continuum without ionization.

Citation

Brewin, A., Gallagher, L. A. P., Pritchett, J. D., Wong, H. Q. X., Potvliege, R. M., Clark, S. J., & Jones, M. P. A. (2024). Microwave-optical spectroscopy of Rydberg excitons in the ultrastrong driving regime. New Journal of Physics, 26(11), Article 113018. https://doi.org/10.1088/1367-2630/ad8c74

• Journal Article Type: Article
• Acceptance Date: Oct 29, 2024
• Online Publication Date: Nov 25, 2024
• Publication Date: Nov 1, 2024
• Deposit Date: Dec 4, 2024
• Publicly Available Date: Dec 4, 2024
• Journal: New Journal of Physics
• Electronic ISSN: 1367-2630
• Publisher: IOP Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 26
• Issue: 11
• Article Number: 113018
• DOI: https://doi.org/10.1088/1367-2630/ad8c74
• Keywords: Floquet theory, cuprous oxide, strong driving, Rydberg excitons, ultrastrong coupling, microwave optical conversion, ultrastrong driving
• Public URL: https://durham-repository.worktribe.com/output/3116047