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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. 2 — a–d Far-field photoluminescence spectra recorded at various pump powers. Excitation with a continuous-wave laser (a), the white line shows calculated single-particle energy s-band in the effective periodic potential. Angled-resolved spectra for pump powers at the condensation threshold (b P = 1.5 nJ/pulse), above the threshold (c P = 6.0 nJ/pulse), and far above the threshold (d P = 29.9 nJ/pulse). The condensed mode moves into the gap. e Integrated emission intensity (black) and linewidth (red) versus excitation energy. At P = 1.5 nJ/pulse, the linewidth drops to the resolution limit of the spectrometer, whereas the intensity clearly features a superlinear increase. f Excitation power-dependent blueshift of the mode.