Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 2: Electronic structure of surfaces: Spectroscopy, surface states I
O 2.5: Talk
Monday, March 9, 2026, 11:45–12:00, HSZ/0201
Fermiology and spin polarization of the topological surface states in PtBi2 — •Stefanie Suzanne Brinkman1, Anders Christian Mathisen1, Xin Liang Tan1, Kristian Maeland2, Øyvind Finnseth1, Fabian Göhler1, Chul Hee Min1, Grisha Shipunov3, Anna Isaeva2, Jorge Ismael Facio4, and Hendrik Bentmann1 — 1Center for Quantum Spintronics, Department of Physics, NTNU, Norway — 2Institute for Theoretical Physics and Astrophysics, University of Würzburg, Germany — 3Institute of Physics, University of Amsterdam, The Netherlands — 4Instituto Balseiro, National University of Cuyo, Argentina
Weyl semimetals host topologically protected Weyl nodes in the bulk, that are connected by Fermi arcs on the surface. In PtBi2, recent reports indicate superconductivity in the surface Fermi arcs at elevated temperatures [1]. In this talk, we will present results from spin- and angle-resolved VUV photoemission experiments for both inequivalent surface terminations of PtBi2. Our measurements, combined with first-principles calculations, establish vastly different low-energy dispersion relations of the Fermi arcs depending on surface termination. Furthermore, we provide evidence for spin polarization of the Fermi arcs. We will discuss the implications of our results for the emergence of unconventional superconductivity on the surface of PtBi2.
[1] Andrii Kuibarov et al., Evidence of superconducting Fermi arcs. Nature 626, 294-299 (2024)
Keywords: ARPES; electronic structure; topological Weyl semimetal; Fermi arcs; spin-ARPES