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Angle-resolved photoemission spectroscopy (ARPES) of bulk 2H-WSe2 for different crystal orientations linked to each other by time-reversal symmetry. This dataset supplements a manuscript, and was used to measure a new observable called time-reversal dichroism in photoelectron angular distributions (TRDAD), which quantifies the modulation of the photoemission intensity upon effective time-reversal operation. Experimental results are in quantitative agreement with both tight-binding model and state-of-the-art fully relativistic calculations performed using the one-step model of photoemission, unambiguously demonstrating that TRDAD reveals its orbital pseudospin texture counterpart.

This work was funded by the Max Planck Society, the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program [grant nos. ERC-2015-CoG-682843, ERC-2015-AdG694097, and H2020-FETOPEN-2018-2019-2020-01 (OPTOLogic, grant agreement no. 899794)], the Grupos Consolidados (IT1249-19); the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) within the Emmy Noether program (grant nos. RE 3977/1 and MS 2558/2-1); the Cluster of Excellence "Advanced Imaging of Matter" (AIM), the SFB925 "Light-induced dynamics and control of correlated quantum systems"; the Collaborative Research Center/Transregio 227 "Ultrafast SpinDynamics" (projects B07 and A09, project number 328545488); the FOR1700 project (project E5, project number 194370842); and the Priority Program SPP 2244 (project no. 443366970). The Flatiron Institute is a division of the Simons Foundation. S.B. acknowledges financial support from the NSERC-Banting Postdoctoral Fellowships Program. T. P. acknowledges financial support from the Alexander von Humboldt Fellowship program of the Alexander von Humboldt Stiftung. Time and angle-resolved photoemission spectroscopy (ARPES) of bulk Td-MoTe2 for p-polarized pump and probe. This dataset, measured at an absorbed fluence of 0.6 mJ/cm2, demonstrates the occurence of an abrupt change in the Fermi surface topology, also called Lifshitz transition. These results supplement a manuscript unveiling a nonequilibrium dynamical route toward ultrafast modification of the Fermi surface topology, experimentally demonstrated here for the first time. The combination of these measurements with state-of-the-art TDDFT+U simulations demonstrates that this nonequilibrium topological electronic transition finds its microscopic origin in the dynamical modification of the effective electronic correlations.