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O: Fachverband Oberflächenphysik
O 36: Poster: Ultrafast Electron Dynamics at Surfaces and Interfaces
O 36.5: Poster
Tuesday, March 19, 2024, 18:00–20:00, Poster C
Coherent and incoherent ultrafast lattice dynamics in WTe2 — •Hanqian Lu1,2, Victoria Taylor2, Hyein Jung1,2, Jannik Malter2, Ralph Ernstorfer1,2, and William Windsor1,2 — 1Technische Universität Berlin — 2Fritz Haber Institute of the Max Planck Society
WTe2 is a layered transition metal dichalogenide, which has attracted significant attention in recent years, in particular due to its potential as a topological material and a polar metal. Here we study its response to ultrafast photoexcitation using femtosecond electron diffraction (FED). We observe both coherent and incoherent photoinduced lattice dynamics, in particular the long-lived 0.23 THz shear mode. We quantify these responses along different crystal axes, and present a microscopic model of atomic vibrations of all atoms in the unit cell.