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Microwave-optical coupling via Rydberg excitons in cuprous oxide

Gallagher, Liam A. P., Rogers, Joshua P., Pritchett, Jon D., Mistry, Rajan A., Pizzey, Danielle, Adams, Charles S., Jones, Matthew P. A., Grünwald, Peter, Walther, Valentin, Hodges, Chris ORCID:, Langbein, Wolfgang ORCID: and Lynch, Stephen A. ORCID: 2022. Microwave-optical coupling via Rydberg excitons in cuprous oxide. Physical Review Research 4 (1) , 013031. 10.1103/PhysRevResearch.4.013031

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We report exciton-mediated coupling between microwave and optical fields in cuprous oxide ( Cu 2 O ) at low temperatures. Rydberg excitonic states with principal quantum number up to n = 12 were observed at 4 K using both one-photon (absorption) and two-photon (second harmonic generation) spectroscopy. Near resonance with an excitonic state, the addition of a microwave field significantly changed the absorption line shape, and added sidebands at the microwave frequency to the coherent second harmonic. Both effects showed a complex dependence on n and angular momentum l . All of these features are in semiquantitative agreement with a model based on intraband electric dipole transitions between Rydberg exciton states. With a simple microwave antenna we already reach a regime where the microwave coupling (Rabi frequency) is comparable to the nonradiatively broadened linewidth of the Rydberg excitons. The results provide an additional way to manipulate excitonic states, and open up the possibility of a cryogenic microwave to optical transducer based on Rydberg excitons

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Additional Information: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Publisher: American Physical Society
ISSN: 2643-1564
Funders: EPSRC
Date of First Compliant Deposit: 13 January 2022
Date of Acceptance: 1 December 2021
Last Modified: 17 May 2023 20:46

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