Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 80: Ultrafast Electron Dynamics at Surfaces and Interfaces I
O 80.1: Vortrag
Donnerstag, 4. April 2019, 10:30–10:45, H16
Ultra-fast core-level dynamics in semiconducting WSe2 — •Maciej Dendzik1, R. Patrick Xian1, Dmytro Kutnyakhov2, Shuo Dong1, Federico Pressacco3, Davide Curcio4, Steinn Agustsson5, Michael Heber2, Jasper Hauer1, Wilfried Wurth2,3, Günter Brenner2, Yves Acremann6, Philip Hofmann4, Martin Wolf1, Laurenz Rettig1, and Ralph Ernstorfer1 — 1Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14915 Berlin, Germany — 2DESY Photon Science, Notkestr. 85, 22607 Hamburg, Germany — 3CFEL, Hamburg University, Luruper Chausee 149, 22761 Hamburg, Germany — 4Aarhus University, 8000 Aarhus C, Denmark — 5JGU Mainz, Staudingerweg 7, 55128 Mainz, Germany — 6ETH Zurich, Otto-Stern-Weg 1, 8093 Zurich, Switzerland
The development of femtosecond XUV sources such as the Free-Electron Laser FLASH [1] combined with recent improvements of electron detection (momentum microscopy [2]) enables studying ultra-fast processes governing the excitations of core-level electrons. Here we present a study of femtosecond dynamics of W4f core levels in semiconducting WSe2. We find that pumping A-exciton at 800 nm induces changes of both position and shape of observed spectra. In particular, we find a distinct change of the symmetric Lorentzian line profile into a metal-like Doniach-Šunjić asymmetric line shape. We follow the time evolution of induced changes and compare it with the dynamics of valence electrons. [1] W. Ackermann et al., Nat. Phot. 1, 336-342(2007) [2] S.V. Chernov et al., Ultramicroscopy 159, 453-463(2015)