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. 2020 Jun 8;11:2863. doi: 10.1038/s41467-020-16656-0

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© The Author(s) 2020

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. 3 — a, f, g Far-field spectra below (left) and above (right) the condensation threshold, corresponding with the pump-potential alignment inserted with a sketch of the position of the pump laser spot (green) aligned with respect to the polariton potential. White lines show calculated single-particle energy bands. b Microscope image of the investigated device, indicating the positioning of the pump spot for on-site pumping. c Spatial coherence measurement under on-site excitation above threshold. d Extracted coherent magnitude and e phase of the condensate in the lattice. The centro-symmetric mirror point is indicated with a green circle in c–e.