Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 103: Topology and Symmetry Protected Materials I
O 103.6: Talk
Thursday, March 19, 2020, 11:45–12:00, WIL A317
Core level and valence band dynamics of Bi2Se3 — •Michael Heber1, Kevin Kühlmann2, Dmytro Kutnyakhov1, Federico Pressacco3, Nils Wind3, Davide Curcio4, Klara Volckaert4, Yves Acremann2, Philip Hofmann4, Kai Rossnagel1,5, and Wilfried Wurth1,3 — 1DESY Photon Science, Hamburg, Germany — 2Department of Physics, ETH Zürich, Switzerland — 3Physics Department, University of Hamburg, Germany — 4Aarhus University, Denmark — 5IEAP, CAU Kiel, Germany
Bi2Se3 is one of the text book examples of a topological insulator. We investigated the ultrafast dynamics in the electronic structure of Bi2Se3 with time- and angle-resolved photoelectron spectroscopy. A time-of-flight-based momentum microscope in a pump-probe setup allows simultaneous detection of the three-dimensional band structure, with both parallel momentum components and binding energy, as well as the delay time in a single scan. Using the monochromatized XUV radiation delivered by the XUV beamline PG2 of FLASH provides the possibility to study the temporal response of the valence band simultaneous with the Se 3d and Bi 5d core levels. The relaxation dynamics of the core levels and the valence band will be presented with a focus on the excited electrons in the surface state above EF.