Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 60: Focus Session: Unoccupied States by Inverse Photoemission I

O 60.4: Vortrag

Mittwoch, 11. März 2026, 11:30–11:45, WILL/A317

Spin-Orbit Effects in Atomic-Layer Materials: Tl on Ag(111) — •Sven Schemmelmann¹, Peter Krüger², Patrick Härtl³, Matthias Bode³, Yuichiro Toichi⁴, Kazuyuki Sakamoto⁴, and Markus Donath¹ — ¹Physikalisches Institut, Universität Münster, Germany — ²Institut für Festkörpertheorie, Universität Münster, Germany — ³Experimentelle Physik II, Universität Würzburg, Germany — ⁴Department of Applied Physics, The University of Osaka, Japan

Growing Tl on Ag(111) results in several structures of the Tl adlayers. For low coverage a TlAg₂ surface alloy is formed [1]. The Tl monolayer and bilayer exhibits moiré superstuctures with a continuous rotation of the Tl adlayer. Interestingly, all these structures exhibit characteristic spin-orbit-induced effects in their unoccupied electronic structure revealed by spin- and angle-resolved inverse photoemission. The surface alloy is predicted to exhibit states with a Rashba-type spin splitting. In experiment, the intensity of these states is too low for a spin analysis [1]. In the Tl monolayer, spin-dependent hybridization of different overlayer states is observed [2]. Surprisingly, also an image-potential state located in front of the surface is found to hybridize with Tl states. The Tl bilayer, in contrast, exhibits a non-Rashba-like spin-polarized Fermi surface whose origin is found in the dispersion of the unoccupied states.

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

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

Keywords: Inverse Photoemission; Atomic-Layer Materials; Spin-Orbit Coupling