Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 29: Topology- and Symmetry-Protected Materials
O 29.9: Talk
Tuesday, March 8, 2016, 12:45–13:00, S051
Resonant photoemission of the spin-polarized electronic structure in strongly spin-orbit coupled systems — •Henriette Maaß, Hendrik Bentmann, Christoph Seibel, Thiago R. F. Peixoto, and Friedrich Reinert — Experimentelle Physik VII, Universität Würzburg, D-97074 Würzburg
Strong spin-orbit coupling leads to a lifting of the spin degeneracy in the electronic structure and the emergence of novel topological phases in non-centrosymmetric environments, such as interfaces or surfaces. Using resonant angle-resolved photoemission experiments (ARPES) we have investigated the spin-polarized electronic structure in the surface alloy BiAg2/Ag(111) and the topological insulator Bi2Te3.
Our data reveals pronounced momentum dependent modulations of the photoemission intensity in the 6p derived surface states of BiAg2/Ag(111), when the photon energy is tuned across the Bi 5d core level excitation. In particular a complete suppression of spectral weight of spin-up and spin-down valence bands occurs for energies shortly below the Bi 5d5/2 and the 5d3/2 core levels, respectively. At the same time a considerable modification of the photoelectron spin-polarization can be observed. We compare these results to the case of the topological insulator Bi2Te3, where similar variations in the photoemission intensity occur.
[1] H. Bentmann et al., arXiv 1507.04664