Journal
NATURE MATERIALS
Volume 21, Issue 7, Pages 767-+Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41563-022-01230-4
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Funding
- EPSRC [EP/T023449/1, EP/S014403/1, EP/L015110/1]
- Royal Society [RGS\R2\192174]
- Carlsberg Foundation through the 'Semper Ardens' Research Project [QCooL]
- NSF
- DFG [SPP1929]
- Danish National Research Foundation through the Center of Excellence 'CCQ' [DNRF156]
- Carnegie Trust for the Universities of Scotland Research Incentive Grant [RIG009823]
- Australian Research Council Centre of Excellence for Engineered Quantum Systems [CE170100009]
- Institute for Theoretical Atomic, Molecular, and Optical Physics at Harvard University
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In this study, the authors achieved strong coupling of light to Cu2O Rydberg excitons and demonstrated the formation of Cu2O Rydberg exciton-polaritons by embedding a thin Cu2O crystal into a Fabry-Perot microcavity. This paves the way towards realizing strongly interacting exciton-polaritons and exploring strongly correlated phases of matter using light on a chip.
Giant Rydberg excitons with principal quantum numbers as high as n = 25 have been observed in cuprous oxide (Cu2O), a semiconductor in which the exciton diameter can become as large as similar to 1 mu m. The giant dimension of these excitons results in excitonic interaction enhancements of orders of magnitude. Rydberg exciton-polaritons, formed by the strong coupling of Rydberg excitons to cavity photons, are a promising route to exploit these interactions and achieve a scalable, strongly correlated solid-state platform. However, the strong coupling of these excitons to cavity photons has remained elusive. Here, by embedding a thin Cu2O crystal into a Fabry-Perot microcavity, we achieve strong coupling of light to Cu2O Rydberg excitons up to n = 6 and demonstrate the formation of Cu2O Rydberg exciton-polaritons. These results pave the way towards realizing strongly interacting exciton-polaritons and exploring strongly correlated phases of matter using light on a chip. Cu2O is a promising platform to host Rydberg exciton-polaritons, where excitons strongly couple to cavity photons, however their realization has been elusive. Here, the authors report Rydberg exciton-polaritons with principal quantum numbers up to n = 6.
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