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O: Fachverband Oberflächenphysik

O 48: Poster Session - Electronic Structure of Surfaces: Spectroscopy, Surface States

O 48.4: Poster

Dienstag, 17. März 2020, 18:15–20:00, P2/EG

The role of the final state in dichroic spin- and angle-resolved photoemission on the Au(111) surface state — •Maximilian Ünzelmann¹, Hendrik Bentmann¹, Tim Figgemeier¹, Raphael Crespo Vidal¹, Thiago R. F. Peixoto¹, Henriette Maaß¹, Chul-Hee Min², and Friedrich Reinert¹ — ¹Experimentelle Physik 7, Universität Würzburg — ²Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel

The Shockley surface state of the Au(111) surface is a paradigmatic example for a Rashba-type spin-splitting of two-dimensional electronic states. By means of spin- and angle-resolved photoemission we have investigated the photoelectron spin polarization and the linear dichroism (LD) in dependence on the photoelectron final state. To this end we conducted measurements in a photon-energy range from 18 eV to 30 eV and compare our results to previous findings for the giant Rashba systems PbAg₂/Ag(111) and BiAg₂/Ag(111) [1]. In all systems the LD changes its sign between energies of roughly 22 eV and 26 eV, likely due to a band gap in the similar final-state band structure of Ag(111) and Au(111). Interestingly, the measured spin polarization of the Shockley surface state is almost constant at these photon energies, in stark contrast to the case of BiAg₂ [1]. We will discuss these results by comparing the different influence of inversion symmetry breaking and spin-orbit coupling on the spin-split electronic wave functions.

[1] Bentmann et al., Phys. Rev. Lett. 119, 106401 (2017).