Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 99: Ultrafast Electron Dynamics IV
O 99.7: Talk
Friday, March 21, 2025, 12:00–12:15, H11
Resolving ultrafast atomic motion in WTe2 — •Hanqian Lu1,2, Victoria C. A. Taylor2, Hyein Jung1,2, Jannik Malter1,2, Ralph Ernstorfer1,2, and Yoav W. Windsor1,2 — 1Technische Universität Berlin, 10623 Berlin, Germany — 2Fritz Haber Institute of the Max Planck Society, 14195 Berlin, Germany
WTe2 is a layered transition metal dichalcogenide with a distorted layered structure leading to distinct material properties. Here we study its lattice dynamics following ultrafast photoexcitation, using femtosecond electron diffraction (FED). We observe a strong coherent lattice response as well as growth of incoherent atomic vibrations, which we qualitatively describe as previously done. With the goal of describing such motions microscopically, we develop a quantitative model that extracts both the coherent and the incoherent atomic motions of each W and Te atom in the unit cell.