Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 66: Electronic Structure of Surfaces
O 66.9: Poster
Mittwoch, 18. März 2015, 18:15–21:00, Poster A
Rashba-splitting in thin Bi-films on a Au(111)-surface — •Dominik Jungkenn1, Sebastian Jakobs1,2, Stepan Tsirkin3, Andreas Ruffing1, Eugene Chulkov3, Mirko Cinchetti1, Stefan Mathias1, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, 67663 Kaiserslautern, Germany — 2Graduate School Materials Science in Mainz, Erwin Schroedinger Straße 46, 67663 Kaiserslautern, Germany — 3Donostia International Physics Center (DIPC), Depto. de Fisica de Materiales and Centro Mixto CSIC-UPV/EHU, Facultad de Ciencias Quimicas, UPV/EHU, 20018 San Sebastian, Spain
The combination of large spin-orbit coupling and a broken inversion symmetry at the surface or interface of a crystal leads to a spin-dependent splitting of the band structure (Rashba-effect [1]), which is of great interest in the growing field of spintronics. The Rashba-effect was observed in different systems with varying splitting magnitudes, e.g surface states, quantum-well states and topological insulators. Here, we investigate the strongly Rashba-type spin-orbit split system Bi/Au(111) using low energy electron diffraction (LEED) and angle resolved photoemission spectroscopy (ARPES). Our results exhibit a spin-split band structure with a so far unrivaled large Rashba parameter (αR=4.78 eVÅ) for a coverage below 1 monolayer (ML). The results are supported by DFT calculations that reproduce our observations in good agreement.
[1] Yu. A. Bychkov, E. I. Rashba. JETP, 39(2), 78-81 (1984)