Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 67: Focus Session: Unoccupied States by Inverse Photoemission II

O 67.5: Vortrag

Mittwoch, 11. März 2026, 16:15–16:30, WILL/A317

Layer-Dependent Electronic Signatures of Tl on Ag(111) Revealed by Inverse Photoemission — •Sarah Laufer¹, Sven Schemmelmann¹, Yuichiro Toichi², Kazuyuki Sakamoto², and Markus Donath¹ — ¹Physikalisches Institut, Universität Münster — ²Department of Applied Physics, The University of Osaka

The Tl/Ag(111) system is characterised by pronounced changes in its spatial and electronic structure when transitioning from sub-monolayer coverage to the monolayer [1,2] and further to the bilayer [3], making an accurate determination of the layer thickness essential. While low-energy electron diffraction and Auger electron spectroscopy provide valuable information on domain orientations and Tl coverage trends, neither technique allows an unambiguous identification of the bilayer. In contrast, inverse photoemission (IPE) gives direct access to unoccupied electronic states, which are highly sensitive to the Tl film thickness. We show that Tl/Ag(111) exhibits distinct layer-dependent unoccupied states whose characteristic intensity evolution with increasing Tl coverage enables a clear identification of the bilayer. These results highlight the particular strength of IPE as a layer-specific probe for ultrathin metallic films.

[1] P. Härtl et al., Phys. Rev. B 107, 205144 (2023)

[2] S. Schemmelmann et al., Phys. Rev. B 109, 165417 (2024)

[3] T. Kobayashi et al., Nano Lett. 23, 7675-7682 (2023)

Keywords: inverse photoemission; unoccupied electronic structure; surface state; atomic-layer materials