SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 59: Electronic Structure of Surfaces I

O 59.4: Vortrag

Mittwoch, 29. März 2023, 16:00–16:15, REC C 213

Surface electronic structure of Re(0001): A spin-resolved photoemission study — •Marcel Holtmann¹, Peter Krüger², Koji Miyamoto³, Taichi Okuda³, Shiv Kumar³, Kenya Shimada³, and Markus Donath¹ — ¹Physikalisches Institut, WWU Münster, Germany — ²Institut für Festkörpertheorie, WWU Münster, Germany — ³HiSOR, Hiroshima University, Japan

The surface electronic structure of Re(0001) has been investigated in a combined experimental and theoretical study. (Spin- and) angle-resolved photoemission was employed to unravel the spin-dependent E(k_∥) dispersion along the Γ M and Γ K directions. The results are compared with band structures from density-functional theory. Moreover, transitions into final states have been considered by inclusion of the corresponding matrix elements. A spin-orbit-induced mixing of Shockley- and Tamm-type surface states around Γ and close to E_F was reported recently [1]. Here, we extend the analysis to a wider E(k_∥) range showcasing a multitude of electronic states along the Γ M and Γ K directions. In particular, Rashba-type spin splittings are observed around the high-symmetry Γ and M points. At variance with theoretical predictions [2], which describe a perfect hcp(0001) surface, we do not find any out-of-plane spin polarization. This is caused by monoatomic steps of a real Re(0001) surface with alternating terminations, which lead on average to an effective sixfold surface symmetry and vanishing net out-of-plane spin polarization.

[1] M. Holtmann et al., Phys. Rev. B 105, L241412 (2022)

[2] A. Urru and A. Dal Corso, Surf. Sci. 686, 22 (2019)