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O: Fachverband Oberflächenphysik

O 43: Poster Tuesday: Electronic Structure

O 43.7: Poster

Dienstag, 2. April 2019, 18:00–20:00, Poster D

Spin effects in the unoccupied electronic structure of Ir(111) and graphene/Ir(111) — •Fabian Schöttke, Katharina T. Ritter, Anke Beck-Schmidt, and Markus Donath — Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Germany

The electronic structure of iridium surfaces is of interest with respect to spin-orbit interaction at surfaces of heavy elements. Especially the Ir(111) surface is the subject of numerous investigations because it is well suited as a substrate for graphene [1]. A two-photon-photoemission study on graphene/Ir(111) using circularly polarized light reports a Rashba-type spin splitting of the image-potential state [2]. However, this result is put into question by another study [3].

We present an inverse-photoemission study with spin resolution on the unoccupied electronic states of Ir(111) and graphene/Ir(111). We address the spin dependence of the image-potential states for the bare Ir(111) surface and the graphene-covered surface in order to examine the interaction of the substrate with the graphene overlayer.

[1] Varykhalov et al., Phys. Rev. Lett. 108, 066804 (2012).

[2] Tognolini et al., Phys. Rev. Lett. 115, 046801 (2015).

[3] Arafune et al., Prog. Surf. Sci. doi:10.1016/j.progsurf.2018.08.001.