Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 11: Electronic Structure of Surfaces: Spectroscopy, Surface States I
O 11.8: Talk
Monday, March 17, 2025, 16:45–17:00, H4
Towards accessing the initial state by dichroic photoemission — •Jakub Schusser1,2, Hibiki Orio1, Maximilian Ünzelmann1, Johannes Heßdörfer1, Muthu Prasath Thirugnanasambandam Masilamani Masilamani1, Florian Diekmann3,4, Kai Rossnagel3,4, and Friedrich Reinert1 — 1Experimentelle Physik VII and Würzburg- Dresden Cluster of Excellence ct.qmat, Universität Würzburg, Würzburg, Germany — 2University of West Bohemia, Pilsen, Czech Republic — 3Ruprecht Haensel Laboratory, DESY, Hamburg, Germany — 4Institute of Experimental and Applied Physics, Kiel University, Germany
Despite its many advantages, photoemission has so far not allowed direct experimental access to detailed information about the initial state of solids. Dichroism in angle-resolved photoemission spectroscopy arises inherently from the matrix-element effects that depend on the initial and final states as well as the light field perturbation. By comparing both experimental and theoretical soft X-ray data in bulk WSe2 we show the robustness of the newly introduced dichroic technique against variation of photon energy, light polarization and angle of incidence. Such robustness of the matrix-element effect represents a leap towards accessing the initial state by this differential technique with high relevance in the field of topological materials, layered systems and other material classes.
Keywords: ARPES; Dichroism; WSe2; Photoemission; DFT