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. 2018 Aug 16;9:3286. doi: 10.1038/s41467-018-05532-7

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Luminescence of GaAs exciton-polaritons and hybrid polaritons. a Momentum-resolved photoluminescence spectra recorded from the device at 4.2 K at the periphery of the monolayer, depicted in a waterfall representation. b Energy–momentum dispersion relation of the signal, following the model of the lower polariton branch in a coupled oscillator system. c Plot of the photoluminescence from the device at the MoSe₂ monolayer position. Two peaks evolve, which are attributed to the hybrid polariton mode and the GaAs polariton resonance from the surroundings of the monolayer. d Energy–momentum dispersion relation of the two modes corresponding with the signals shown in c. The discrete, hybrid polariton mode is a result of an admixture of 21.0% GaAs, 21.5% MoSe₂, and 57.6% photon (see Supplementary Note 1)