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O: Fachverband Oberflächenphysik
O 48: Poster Session - Electronic Structure of Surfaces: Spectroscopy, Surface States
O 48.1: Poster
Dienstag, 17. März 2020, 18:15–20:00, P2/EG
Rashba-split surface state on Re(0001) investigated by STM — •Johannes Regel1, Torge Mashoff1, Jan Minar2, Jürgen Braun3, Hubert Ebert3, and Hans-Joachim Elmers1 — 1Institut für Physik, Johannes Gutenberg-Universität, Mainz — 2University of West Bohemia, Pilsen, Czech Republic — 3Department Chemie, Ludwig Maximilians-Universität, München
The electronic structure of surfaces differs significantly from the bulk structure. Due to the broken symmetry, surface states and resonances are formed at the surface. A strong spin-orbit coupling, as given for Re, leads to Rashba spin splitting of these states. Although the strong spin momentum coupling should suppress backscattering, Re(0001) shows quantum interference patterns in the proximity of 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 wavelength, phase and damping of the surface states. Additionally, we use molecular beam epitaxy to deposit pseudomorphic sub-monolayers of Au and Ni and study their influence on the complex reflection coefficient of the surface wave function. The dispersion relations of the surface states are compared with theoretical results and show good agreement.