Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 11: PtBi2
TT 11.4: Talk
Monday, March 9, 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-Tc, 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 Bc – 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