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O: Fachverband Oberflächenphysik

O 92: Poster Session VII: Ultrafast electron dynamics at surface and interfaces III

O 92.1: Poster

Donnerstag, 4. März 2021, 10:30–12:30, P

FEL based tr-ARPES of ultrafast electron dynamics in quantum materials — •M. Heber¹, K. Kühlmann², D. Kutnyakhov¹, F. Pressacco¹, N. Wind³, D. Curcio⁴, K. Volckaert⁴, V. Shokeen⁵, A. Yaroslavsev⁵, H. Noei¹, M. Wagstaffe¹, Ch. Sanders⁶, S. Y. Agustsson⁷, H. Redlin¹, S. Dziarzhytski¹, G. Brenner¹, L. Wenthaus¹, K. Medjanik⁷, H.J. Elmers⁷, G. Schönhense⁷, Y. Acremann², Ph. Hofmann⁴, H. Dürr⁵, W. Wurth^1,3, and K. Rosnagel^1,8 — ¹DESY, Hamburg, D — ²Department of Physics, ETH Zürich, CH — ³Physics Department, University of Hamburg, D — ⁴Aarhus University, DK — ⁵Uppsala University, S — ⁶Rutherford Appleton Laboratory, Harwell, GB — ⁷University of Mainz, D — ⁸IEAP, CAU Kiel, D

We investigated the ultrafast electronic structure dynamics of various quantum materials by time- and angle-resolved photoelectron spectroscopy. To this end, a time-of-flight momentum microscope enabling the parallel detection of the photoelectrons two surface-parallel momentum components plus their kinetic energy was combined with the short-pulsed monochromatized XUV radiation from the PG2 beamline of FLASH at DESY. The use of XUV pulses specifically provides the possibility to study the combined temporal response of valence and core electrons. Here, the results of three different experiments will be presented, focusing on the Dirac cone of graphene on Ir(111), the surface and bulk valence bands and core levels of Bi₂Se₃, as well as the hot electrons in a thin ferromagnetic nickel film on W(110). Pump fluence- and momentum-dependent dynamical effects will be discussed.