Strong coupling between light and elementary excitations is emerging as a powerful tool to engineer the properties of solid-state systems. Spin-correlated excitations that couple strongly to optical cavities promise control over collective quantum phenomena such as magnetic phase transitions, but their suitable electronic resonances are yet to be found. Here, we report strong light–matter coupling in NiPS3, a van der Waals antiferromagnet with highly correlated electronic degrees of freedom. A previously unobserved class of polaritonic quasiparticles emerges from the strong coupling between its spin-correlated excitons and the photons inside a microcavity. Detailed spectroscopic analysis in conjunction with a microscopic theory provides unique insights into the origin and interactions of these exotic magnetically coupled excitations. Our work introduces van der Waals magnets to the field of strong light–matter physics and provides a path towards the design and control of correlated electron systems via cavity quantum electrodynamics.
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The main data sets generated and/or analysed during the current study are available at . All supplementary data will be provided by the corresponding authors upon reasonable request.
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We thank A. J. Millis, A. Punnoose, and X. Xu for useful discussions. Work at CUNY was supported through the NSF QII TAQS 1936276 (V.M.M., R.B.), the NSF CREST IDEALS center (V.M.M.), NSF DMR-2011738 (B.D.), and Army Research Office MURI grant W911NF-17-1-0312 (V.M.M. and A.H.M.). E.B. acknowledges support from the Robert A. Welch Foundation (grant F-2092-20220331). A.K. acknowledges support from a Graduate School Continuing Fellowship at the University of Texas at Austin. F.D. was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) through Projektnummer 451072703.
The authors declare no competing interests.
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Dirnberger, F., Bushati, R., Datta, B. et al. Spin-correlated exciton–polaritons in a van der Waals magnet. Nat. Nanotechnol. 17, 1060–1064 (2022). https://doi.org/10.1038/s41565-022-01204-2