Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 89: Metal and Semiconductor Substrates: Structure, Epitaxy and Growth
O 89.5: Talk
Thursday, March 20, 2025, 16:00–16:15, H8
Bilayer Formation of Tl on Ag(111): Spatial and Electronic Structural Insights — •Sarah Laufer1, Sven Schemmelmann1, Yuichiro Toichi2, Kazuyuki Sakamoto2, and Markus Donath1 — 1Physikalisches Institut, Universität Münster, Germany — 2Department of Applied Physics, Osaka University, Japan
Ultrathin thallium films on Ag(111) have become a model system for studying the spatial and electronic properties of atomic-layer systems [1-3]. In this study, we focus on investigating the formation of bilayer Tl on Ag(111), leveraging Auger electron spectroscopy, low energy electron diffraction (LEED), and inverse photoemission (IPE) to investigate both spatial and electronic structure. LEED studies indicate that the Tl layers are rotated with respect to the substrate, with the angle of rotation depending on the Tl coverage and deposition temperature. Furthermore, IPE measurements reveal distinct unoccupied electronic states for both the monolayer and the bilayer. With increasing deposition time, the intensity of the monolayer-related state is reduced, while the intensity of the bilayer-related state increases. These results provide insight into the bilayer growth mechanism of Tl on Ag(111) and offer experimental criteria for differentiating between mono- and bilayer.
[1] T. Kobayashi et al., Nano Lett. 23, 7675-7682 (2023)
[2] P. Härtl et al., Phys. Rev. B 107, 205144 (2023)
[3] S. Schemmelmann et al., Phys. Rev. B 109, 165417 (2024)
Keywords: inverse photoemission; unoccupied electronic structure; surface state