SKM 2023 – wissenschaftliches Programm
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SYUE: Symposium Ultrafast Excitation Pathways of Quantum Materials
SYUE 1: Ultrafast Excitation Pathways of Quantum Materials
SYUE 1.5: Hauptvortrag
Mittwoch, 29. März 2023, 11:45–12:15, HSZ 01
Witnessing many-body entanglement in light-driven quantum materials — •Matteo Mitrano1, Denitsa Baykusheva1, Mona Kalthoff2, Damian Hofmann2, Martin Claassen3, Dante Kennes2,4, and Michael Sentef2 — 1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA — 2Max Planck Institute for the Structure and Dynamics of Matter, Center for Free-Electron Laser Science (CFEL), Luruper Chaussee 149, 22761 Hamburg, Germany — 3Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA — 4Institut für Theorie der Statistischen Physik, RWTH Aachen University, 52056 Aachen, Germany and JARA-Fundamentals of Future Information Technology, 52056 Aachen, Germany
Many-body entanglement in condensed matter systems can be diagnosed from equilibrium response functions through the use of entanglement witnesses and operator-specific quantum bounds. Here, we investigate the applicability of this approach for detecting entangled states in quantum systems driven out of equilibrium. We use a multipartite entanglement witness, the quantum Fisher information, to study the dynamics of a paradigmatic fermion chain undergoing a time-dependent change of the Coulomb interaction. Our results show that the quantum Fisher information is able to witness distinct signatures of multipartite entanglement both near and far from equilibrium that are robust against decoherence. We discuss implications of these findings for probing entanglement in light-driven quantum materials with time-resolved optical and x-ray scattering methods.