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O: Fachverband Oberflächenphysik
O 72: Mini-Symposium: Coherent band structure engineering with light II
O 72.3: Talk
Wednesday, March 3, 2021, 14:15–14:30, R2
Ultrafast Dynamical Lifshitz Transition — •Samuel Beaulieu1,2, Shuo Dong1, Nicolas Tancogne-Dejean3, Maciej Dendzik1,4, Tommaso Pincelli1, Julian Maklar1, R. Patrick Xian1, Michael Sentef3, Martin Wolf1, Angel Rubio3,5, Laurenz Rettig1, and Ralph Ernstorfer1 — 1Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany — 2Université de Bordeaux - CNRS - CEA, CELIA, UMR5107, F33405 Talence, France — 3Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany — 4Department of Applied Physics, KTH Royal Institute of Technology, Electrum 229, SE-16440, Stockholm, Kista, Sweden — 5Center for Computational Quantum Physics (CCQ), The Flatiron Institute, 162 Fifth Avenue, New York NY 10010
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. Combining time-resolved multidimensional photoemission spectroscopy with state-of-the-art TDDFT+U simulations, we introduce a novel scheme for driving an ultrafast Lifshitz transition in the correlated type-II Weyl semimetal Td-MoTe2. We demonstrate that this non-equilibrium topological electronic transition finds its microscopic origin in the dynamical modification of the effective electronic correlations.