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TT: Fachverband Tiefe Temperaturen
TT 36: Weyl Semimetals (joint session MA/TT)
TT 36.3: Vortrag
Dienstag, 10. März 2026, 14:30–14:45, POT/0361
Peierls-induced topological Weyl semimetal in PtBi2 — •Anders C. Mathisen1, Stefanie S. Brinkman1, Xin L. Tan1, Øyvind Finnseth1, Fabian Göhler1, Chul-Hee Min1, Jens Buck2, Kai Rossnagel2, Grisha Shipunov3, Anna Isaeva3, Jorge I. Facio4, and Hendrik Bentmann1 — 1Center for Quantum Spintronics, Department of Physics, NTNU, Norway — 2Kiel University & DESY, Germany — 3Institute of Physics, University of Amsterdam, The Netherlands — 4Instituto Balseiro, National University of Cuyo, Argentina
PtBi2 is attracting interest because of its exotic electronic properties, including bulk Weyl nodes, Fermi-arc surface states, and unconventional surface superconductivity. The emergence of Weyl nodes in materials is commonly attributed to accidental crossings between non-degenerate valence and conduction bands, while little emphasis has been placed on the physical mechanisms that induce Weyl physics. Recent theory indicates that reduced translational symmetry in the Peierls-distorted crystal structure of PtBi2 constitutes a mechanism for the formation of Weyl nodes [1]. In this talk, we will present an investigation of the bulk electronic structure of PtBi2 using soft X-ray angle-resolved photoelectron spectroscopy. Based on an analysis of the spectral weight across wide regions in momentum space, we show how the Peierls-distortion in PtBi2 promotes the formation of Weyl nodes.
[1] S. Palumbo et al., Interplay between inversion and translation symmetries in trigonal PtBi2. Phys. Rev. B 112, 205125 (2025)
Keywords: ARPES; electronic structure; topological Weyl semimetal; Fermi arcs