Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 86: Electronic Structure of Surfaces: Spectroscopy, Surface States II
O 86.5: Vortrag
Donnerstag, 20. März 2025, 16:00–16:15, H2
Visualizing topological ladder in PtTe2 — •Mohammed Qahosh1, Gustav Bihlmayer2, Jakub Schusser3, Muthu Masilamani3, Friedrich Reinert3, Claus M. Schneider1, and Lukasz Plucinski1 — 1PGI-6 Forschungszentrum-Jülich — 2PGI-1/IAS-1 Forschungszentrum-Jülich — 3Experimentelle Physik VII and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg
We have examined the topological ladder [1] and band inversions in PtTe2 using spin-polarized angle-resolved photoemission (spin-ARPES) with two-dimensional momentum imaging. Examining such spin images allows in-depth insight into the topological properties, not accessible by routine methods. We mapped extended momentum-space regions and visualized distinct topological ladder states, notably a surface Dirac cone at EB ∼ 2.3 eV, as well as states at EB ∼ 1.0 eV, EB ∼ 1.6 eV, and near the Fermi level. By comparison to ab initio calculations, we demonstrate a significant correlation between the measured and the initial state spin polarization. We discuss interatomic phase shifts [2] for orbitals mixed between Pt and Te sites as well as spin-orbit scattering that leads to additional spin polarization in spin-ARPES. [1] Nature Materials 17, 21 (2018). [2] Phys. Rev. Lett. 130, 146401 (2023).
Keywords: Spin-ARPES; spin-texture asymmetry; surface states; final-state effect; initial-state