Abstract

Two-dimensional atomic crystals of graphene, as well as transition-metal dichalcogenides, have emerged as a class of materials that demonstrate strong interaction with light. This interaction can be further controlled by embedding such materials into optical microcavities. When the interaction rate is engineered to be faster than dissipation from the light and matter entities, one reaches the ‘strong coupling’ regime. This results in the formation of half-light, half-matter bosonic quasiparticles called microcavity polaritons. Here, we report evidence of strong light–matter coupling and the formation of microcavity polaritons in a two-dimensional atomic crystal of molybdenum disulphide (MoS2) embedded inside a dielectric microcavity at room temperature. A Rabi splitting of 46 ± 3 meV is observed in angle-resolved reflectivity and photoluminescence spectra due to coupling between the two-dimensional excitons and the cavity photons. Realizing strong coupling at room temperature in two-dimensional materials that offer a disorder-free potential landscape provides an attractive route for the development of practical polaritonic devices.

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Acknowledgements

X.L., T.G., Z.S. and V.M. acknowledge support from the Army Research Office (grant no. W911NF1310001) and the National Science Foundation MRSEC programme (grant no. DMR 1120923). F.X. acknowledges support from the Air Force Office of Scientific Research. Y.H.L. and E.C.L. acknowledge support from the Ministry of Science and Technology of the Republic of China (103-2112-M-007-001-MY3). S.K.C. acknowledges support from the NSERC Discovery grant programme.

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Affiliations

  1. Department of Physics, City College of New York, New York, New York 10031, USA

    • Xiaoze Liu
    • , Tal Galfsky
    • , Zheng Sun
    •  & Vinod M. Menon
  2. Department of Physics, Queens College & Graduate Centre, City University of New York, New York, New York 11367, USA

    • Xiaoze Liu
    • , Tal Galfsky
    • , Zheng Sun
    •  & Vinod M. Menon
  3. Department of Electrical Engineering, PO Box 208267, Yale University, New Haven, Connecticut 06520, USA

    • Fengnian Xia
  4. Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan

    • Erh-chen Lin
    •  & Yi-Hsien Lee
  5. Department of Engineering Physics, École Polytechnique de Montréal, Montréal, Quebec, Canada

    • Stéphane Kéna-Cohen

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Contributions

V.M. and F.X. initiated the project. X.L., V.M. and F.X. designed the experiments. X.L. fabricated the microcavity samples. X.L. and Z.S. collected the data and X.L., S.K.C. and V.M. analysed it. E.C.L. and Y.H.L. grew the CVD monolayer MoS2. X.L. and T.G. performed the theoretical modelling. All authors contributed to the discussion of the results and writing the manuscript.

Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to Vinod M. Menon.

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DOI

https://doi.org/10.1038/nphoton.2014.304

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