Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 29: Topology- and Symmetry-Protected Materials
(Joint session of DS, HL, MA, O and TT organized by O)

TT 29.9: Vortrag

Dienstag, 8. März 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 5d_5/2 and the 5d_3/2 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