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. 2018 Oct 17;9:4322. doi: 10.1038/s41467-018-06801-1

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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 — Collapse of the flat band in Ta₂NiSe₅. a Energy–momentum map of Ta₂Ni(Se_0.97S_0.03)₅ measured by using an XUV pulse (27.9 eV) before the arrival of the pump pulse (1.55 eV) at 100 K. b TARPES spectrum at the Γ point, obtained with a pump fluence of 0.78 mJ cm⁻². c Temporal evolution of the integrated TARPES intensity in the red square shown in a for different pump fluences. The arrows indicate the minimum values of the spectral weight. d Extracted drop time of the flat band τ_Flat as a function of the pump fluence. Blue and red symbols corresponds to Ta₂Ni(Se_0.97S_0.03)₅ and Ta₂NiS₅, respectively. The error bars roughly correspond to the standard deviations