Ultrafast Light-Induced Lifshitz Transition

Science Advances 7, 17, eabd9275 (2021)

Ultrafast Light-Induced Lifshitz Transition

Samuel Beaulieu, Shuo Dong, Nicolas Tancogne-Dejean, Maciej Dendzik, Tommaso Pincelli, Julian Maklar, R. Patrick Xian, Michael A. Sentef, Martin Wolf, Angel Rubio, Laurenz Rettig, Ralph Ernstorfer

Fermi surface is at the heart of our understanding of metals and strongly correlated many-body systems. An abrupt change in the Fermi surface topology, also called Lifshitz transition, can lead to the emergence of fascinating phenomena like colossal magnetoresistance and superconductivity. While Lifshitz transitions have been demonstrated for a broad range of materials and using different types of static external perturbations such as strain, doping, pressure and temperature, a non-equilibrium route toward ultrafast and transient modification of the Fermi surface topology has not been experimentally demonstrated. Combining time-resolved multidimensional photoemission spectroscopy with state-of-the-art TDDFT+U simulations, we introduce a scheme for driving an ultrafast Lifshitz transition in the correlated Weyl semimetal T d -MoTe 2 . We demonstrate that this non-equilibrium topological electronic transition finds its microscopic origin in the dynamical modification of the effective electronic correlations. These results shed light on a novel ultrafast and all-optical scheme for controlling the Fermi surface topology in correlated quantum materials.

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This work was funded by the Max Planck Society, the European Research Council (ERC) under the European Unions Horizon 2020 research and innovation program (Grant No. ERC- 2015-CoG-682843 and ERC-2015-AdG694097), the German Research Foundation (DFG) within the Emmy Noether program (Grant No. RE 3977/1 and MS 2558/2-1), the Cluster of Excellence ”Advanced Imaging of Matter” (AIM), Grupos Consolidados (IT1249-19), the SFB925 ”Light induced dynamics and control of correlated quantum systems” and the Collaborative Research Center/Transregio 227 ”Ultrafast Spin Dynamics” (project B07). The Flatiron Institute is a division of the Simons Foundation. S.B. acknowledges financial support from the NSERC-Banting Postdoctoral Fellowships Program.

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