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O: Fachverband Oberflächenphysik
O 99: Ultrafast Electron Dynamics IV
O 99.3: Vortrag
Freitag, 21. März 2025, 11:00–11:15, H11
Ultrafast charge density wave, Van Hove singularity and flat-band dynamics in the Kagome metal CsV3Sb5 — •Mohamed Amine Wahada1, Chris Nicholson1, Andrea Capa Salinas2, Brenden R. Ortiz2, Lawson Lloyd3, Tommaso Pincelli3, Tulio de Castro1, Martin Wolf1, Ralph Ernstorfer3, Stephen D. Wilson2, and Laurenz Rettig1 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany — 2Materials Department and California Nanosystems Institute, University of California Santa Barbara, Santa Barbara, California 93106, USA — 3Institut für Optik und Atomare Physik, Technische Universität Berlin, 10623 Berlin, Germany
The Kagome metal family AV3Sb5 (A=K, Rb, Cs) features an unconventional superconducting phase, coexisting with a parent charge density wave (CDW) phase. The origin of the CDW is still under debate. Moreover, this family exhibits a number of Van Hove Singularities (VHS) and a flat-band (FB) below the Fermi level, offering a unique platform for high electronic correlation. In order to gain insight into these properties, we study the ultrafast dynamics in CsV3Sb by using time and angle-resolved photoemission spectroscopy (trARPES). We discuss the ultrafast melting of CDW order, concomitant with a shift and a broadening for both the FB and the VHS, all being modulated by coherent phonon modes.
Keywords: Charge density wave; flat-band; Van Hove singularity; correlation; Kagome