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TT: Fachverband Tiefe Temperaturen
TT 45: PtBi2 and Weyl Superconductors
TT 45.5: Talk
Wednesday, March 20, 2024, 12:30–12:45, H 3010
Topological Fermi arcs in superconducting Weyl semimetal candidate t-PtBi2 revealed by quasiparticle interference — •Sebastian Schimmel1,2, Sven Hoffmann1,2, Riccardo Vocaturo2, Joaquin Puig3, Grigoriy Shipunov2, Oleg Janson2, Saicharan Aswartham2, Danny Baumann2, Julia Besproswanny1,2, Bernd Büchner2, Jeroen van den Brink2, Yanina Fasano2,3, Jorge I. Facio3, and Christian Hess1,2 — 1Bergische Univertsität Wuppertal, 42119 Wuppertal, Germany — 2Leibniz Institute for Solid State and Materials Research, 01069 Dresden, Germany — 3Centro Atómico Bariloche and Instituto Balseiro, CNEA,CONICET and Instituto de Nanociencia y Nanotecnología , 8400 San Carlos de Bariloche, Argentina
Trigonal PtBi2 (t-PtBi2) is promising candidate material for topological superconductivity. Ab-initio calculations predicted Weyl-nodes near the Fermi-level [1], and ARPES [2] as well as STM/STS [3] reveal signatures of surface superconductivity at T > 5 K – one order of magnitude higher T than the bulk Tc. Here we report on the Weyl nature of t-PtBi2 experimentally addressed via quasiparticle interference investigations. The revealed scattering channels can be attributed to the predicted Fermi arcs – the hall mark surface features of a Weyl semimetal. Our findings thus experimentally corroborate the non-trivial topology of the surface electrons in t-PtBi2.
[1] A. Veyrat et al., ACS Nano Lett. (2023)
[2] A. Kuibarov et al., arXiv:2305.02900 (2023)
[3] S. Schimmel et al., arXiv:2302.08968 (2023)
Keywords: topology; weyl semimetal; topological superconductivity; Fermi arcs; scanning tunneling spectroscopy