Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 104: Ultrafast Electron Dynamics III (joint session O/MA)
O 104.4: Talk
Thursday, March 19, 2020, 11:15–11:30, WIL B321
Ultrafast Light-Induced Lifshitz Transition — •Samuel Beaulieu1, Shuo Dong1, Nicolas Tancogne-Dejean2, Maciej Dendzik1, Julian Maklar1, Tomasso Pincelli1, R. Patrick Xian1, Martin Wolf1, Angel Rubio2,3, Michael A. Sentef2, Laurenz Rettig1, and Ralph Ernstorfer1 — 1Fritz-Haber- Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany — 2Max Planck Institute for the Structure and Dynamics, of Matter and Center for Free-Electron Laser Science, Luruper Chaussee 149, 22761 Hamburg, Germany — 3Center 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 the properties 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 like strain, doping, pressure and temperature, a nonequilibrium route toward ultrafast and transient switching of the Fermi surface topology has not been demonstrated yet. Using time-resolved multidimensional photoemission spectroscopy combined with TDDFT+U simulations, we demonstrate a scheme based on ultrafast laser-driven band renormalization that drives a Lifshitz transition in the topological type-II Weyl semimetal Td−MoTe2, due to transient modification of effective electron-electron interactions.