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TT: Fachverband Tiefe Temperaturen

TT 11: PtBi₂

TT 11.4: Vortrag

Montag, 9. März 2026, 12:00–12:15, CHE/0091

t-PtBi₂: Topological Fermi Arcs and Surface Superconductivity from Quasiparticle Interference — •Julia Besproswanny¹, Sebastian Schimmel¹, Sven Hoffmann¹, Gregory Shipunov², Saicharan Aswartham², Joaquin Puig³, Yanina Fasano³, Danny Baumann², Riccardo Vocaturo², Jorge I. Facio³, Oleg Janson², Jeroen van den Brink², Bernd Büchner², and Christian Hess¹ — ¹University of Wuppertal, 42119 Wuppertal, Germany — ²IFW Dresden, 01069 Dresden, Germany — ³Centro Atómico Bariloche, Instituto Balseiro, 8400 Bariloche, Argentina

Non-centrosymmetric trigonal PtBi₂ hosts a rich electronic structure that gives rise to several quantum phenomena. In particular, the coexistence of topological surface states and surface superconductivity suggests that it may be an intrinsic, possibly high-T_c, topological superconductor. ARPES [1] shows that superconductivity in t-PtBi₂ is both intertwined with and confined to its topological surface states.

By means of low-temperature scanning tunneling spectroscopy and quasi-particle interference investigations, we probe the local topological and superconducting properties and their interplay on the surface of t-PtBi2. The revealed scattering channels originate from the topological Fermi arcs. These QPI signatures are suppressed in the superconducting state, while re-emerging above B_c – highlighting the close connection between superconductivity and topology.
[1] A. Kuibarov et. al., Nature 626, 294 (2024).

Keywords: Scanning tunneling microscopy; superconductivity; topology; Weyl semimetal; topological superconductivity