Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 80: Ultrafast Electron Dynamics at Surfaces and Interfaces I
O 80.4: Vortrag
Donnerstag, 4. April 2019, 11:15–11:30, H16
Interplay between CDW quenching and the excited phonon population in TiSe_2, observed via ultrafast transmission electron diffraction — •William WINDSOR1, Daniela Zahn1, Helen Seiler1, Ralph Ernstorfer1, Laurenz Rettig1, and Kai Rossnagel2 — 1Fritz-Haber-Institut der MPG (DE) — 2University of Kiel (DE)
TiSe2 is a 2D material which exhibits a charge density wave (CDW) below 200K, with a CDW-driven energy gap of 0.4eV. Here we study ultrafast structural dynamics of the CDW phase following a mid-IR excitation, slightly above the gap. We observe the quenching of the CDW, followed by Subsequent dynamics of the lattice, and a varying excited population of high- and low-wavevector phonons within the inelastic background. Dynamics of the CDW, the lattice and the inelastic background will be comparatively discussed.