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.