SKM 2023 – scientific programme

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O: Fachverband Oberflächenphysik

O 85: Electronic Structure of Surfaces II

O 85.7: Talk

Thursday, March 30, 2023, 16:30–16:45, REC C 213

Circular dichroism in angle-resolved photoemission from core-level emission of W(110) — •Trung Phuc Vo¹, Olena Tkach^2,3, Katerina Medjanik², Olena Fedchenko², Hans-Joachim Elmers², Gerd Schönhense², and Ján Minár¹ — ¹New Technologies - Research Centre, University of West Bohemia, 301 00 Pilsen, Czech Republic — ²Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudingerweg 7, D-55128 Mainz, Germany — ³Sumy State University, Rymski-Korsakov 2, 40007 Sumy, Ukraine

Angle-resolved photoemission spectroscopy (ARPES) is a driving experimental technique for examining the electronic structure of quantum materials. There is another technique called X-ray photoelectron diffraction (XPD) which is considered to be the same thing as ARPES from an elementary point of see, specifically the angular distribution of photoelectrons emitted from a crystal surface. Nevertheless, the angular distribution of emitted electrons represents the momentum of initial states in ARPES meanwhile it reveals the interference of photoelectron waves from final states in XPD. At high photon energies, photoelectron diffraction (PED) effects are found in ARPES measurements beside other obstacles (e.g. non-negligible phonon scattering). Here, to disentangle these diffraction influences, we present a PED implement for SPRKKR package which makes use of multiple scattering theory and one-step model in photemission process. For the sake of applications, we have calculated the circular dichroism in angular distributions (CDAD) associated with of 4f and 3d states from W(110). Photoelectrons are excited by hard X-rays (6000 eV).