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. 2020 Aug 12;11:4037. doi: 10.1038/s41467-020-17608-4

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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. 1 — a Color map of the variation of the PL intensity as a function of B_// (the PL intensity of the bright exciton has been normalized at each field); b PL spectra for magnetic fields from 0 to 30 T showing the emergence of the brightened dark exciton at low energy. c Ratio of the PL intensity of dark (X_D) and bright (X_B) excitons as a function of magnetic field. Inset: sketch of the excitonic fine structure. The arrows ↑ and ↓ represent the main spin contribution of conduction and valence electrons involved in the exciton states (see ref. ²² for more details).