Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 43: Poster Tuesday: Electronic Structure
O 43.3: Poster
Dienstag, 2. April 2019, 18:00–20:00, Poster D
STM-Investigations of Re(0001) suface states — •Johannes Regel1, Torge Mashoff1, Jürgen Braun2, Hubert Ebert2, and Hans-Joachim Elmers1 — 1Institut für Physik, Johannes Gutenberg-Universität, Mainz — 2Department Chemie, Ludwig Maximilians-Universität, München
Due to the broken symmetry, the electronic structure of surfaces can differ significantly from the bulk structure. In case of strong spin-orbit coupling, as given in rhenium, this can lead to Rashba spin splitting of the electronic states. Although the strong spin momentum should forbid backscattering, the rhenium surface shows standing waves in the local density of states originating from defects and step edges. We investigate the electronic states of the Re(0001) surface using low temperature scanning tunneling microscopy and spectroscopy. Differential conductivity measurements lead to an energy-dependent analysis of the wavelength, phase and damping of these states. Additionally, we use molecular beam epitaxy to deposit sub-monolayer gold and nickel islands onto the Re-surface and study their influence on the measurements as well as the pseudomorphic growth of these metals. Our results are compared with one-step model calculations of the electronic structure of rhenium and show good agreement.