Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 95: Electronic Structure of Surfaces II: Spectroscopy, Surface States
O 95.9: Vortrag
Donnerstag, 21. März 2024, 17:00–17:15, MA 144
Electronic structure of the (√3×√3)R30∘ TlAg2 surface alloy on Ag(111) — •Sven Schemmelmann1, Patrick Härtl2, Peter Krüger3, Matthias Bode2, and Markus Donath1 — 1Physikalisches Institut, Universität Münster — 2Physikalisches Institut, Experimentelle Physik II, Universität Würzburg — 3Institut für Festkörpertheorie, Universität Münster
The BiAg2 surface alloy on Ag(111) exhibits a giant Rashba splitting which is one order of magnitude larger than the splitting of the L-gap surface state on Au(111) [1]. We investigate the unoccupied electronic structure of the similar (√3×√3)R30∘ TlAg2 surface alloy by scanning tunneling spectroscopy (STS) and angle-resolved inverse photoemission (IPE) [2]. We observe two dominant empty-state electronic features, which are attributed to downward dispersing s, pz -derived states and to states with pz orbital symmetry, respectively. On the basis of bandstructure and charge distribution calculations, we discuss the variation of the binding energies of the respective electronic features observed by STS and IPE.
[1] Ast et al., Phys. Rev. Lett. 98, 186807 (2007)
[2] Härtl et al., Phys. Rev. B 107, 205144 (2023)
Keywords: Electronic structure; Inverse photoemission; Scanning tunneling spectroscopy; Surface alloy