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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.