Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 95: Electronic Structure of Surfaces II: Spectroscopy, Surface States
O 95.8: Vortrag
Donnerstag, 21. März 2024, 16:45–17:00, MA 144
On the unoccupied electronic structure of Hf(0001) — •Lennard Strompen1, Vincent Reinartz1, Sven Schemmelmann1, Karol Hricovini2, Saleem Khan3, Jan Mínar3, and Markus Donath1 — 1Universität Münster, Muenster, Germany — 2CY Cergy Paris University, Paris, France — 3University of West Bohemia, Pilsen, Czech Republic
Spin-orbit-induced effects are of particular importance in the surface electronic structure of high-Z materials. In our study, we focus on the unoccupied electron states at the so far unexplored Hf(0001) surface. The first challenge was to prepare a well-ordered and clean Hf(0001) surface, which, according to the literature, is known to show considerable impurities, in particular oxygen. After having developed a successful preparation recipe, we used spin- and angle-resolved inverse photoemission to determine the energy vs wavevector dispersion of the unoccupied states along the high-symmetry directions ΓM and ΓK. Besides bulk-related spectral features and an image-potential-induced surface state, we identify surface-related features, which are interpreted on the basis of calculations of the electronic structure.
Keywords: Hafnium; Hf(0001); inverse photoemission spectroscopy; electronic structure