SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 59: Electronic Structure of Surfaces I

O 59.6: Vortrag

Mittwoch, 29. März 2023, 16:30–16:45, REC C 213

One monolayer of Tl on Ag(111): Hybridization of image-potential states with Tl states — •Sven Schemmelmann¹, Patrick Härtl², Peter Krüger³, Matthias Bode², and Markus Donath¹ — ¹Physikalisches Institut, Westfälische Wilhelms-Universität, Münster — ²Physikalisches Institut, Experimentelle Physik II, Universität Würzburg — ³Institut für Festkörpertheorie, Westfälische Wilhelms-Universität, Münster

For one atomic layer of Tl on Ag(111) a moiré superstructure is observed. The unoccupied electronic structure of this superstructure is investigated by spin- and angle-resolved inverse photoemission. The experimental results are interpreted on the basis of DFT calculations. We observe several Tl-induced surface states and an image-potential state mainly located several Å in front of the surface. Surprisingly, we find a hybridization of this image state with a downward dispersing Tl band. This leads to spin-dependent spectral intensities that vary rapidly close to the hybridization point. The calculations show an expeditious change of the charge density from a resonant image-potential state towards a Tl-induced surface state in dependence of k_∥.