Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 57: Topology: Poster
TT 57.12: Poster
Wednesday, March 20, 2024, 15:00–18:00, Poster E
STM studies on the Weyl-semimetal and superconductor trigonal PtBi2 — •Julia Besproswanny1, Sebastian Schimmel1, Sven Hoffmann1, Gregory Shipunov2, Saicharan Aswartham2, Joaquin Puig3, Yanina Fasano3, Danny Baumann2, Jeroen van den Brink2, Ricardo Vocaturo2, Jorge I. Facio3, Bernd Büchner2, and Christian Hess1 — 1University of Wuppertal, 42119 Wuppertal, Germany — 2IFW Dresden, 01069 Dresden, Germany — 3Centro Atómico Bariloche, Instituto Balseiro, 8400 Bariloche, Argentina
We report a comprehensive study of the type-I Weyl-semimetal PtBi2, exploring its topological and superconducting properties through low-temperature scanning tunneling microscopy and spectroscopy.
Quasi-particle-interference measurements confirm the topological nature through the presence of Fermi-arcs. Spectroscopic investigations reveal sample dependent electronic structure near the Fermi-level, ranging from metallic characteristics to the presence of particle-hole symmetric energy gaps implying superconductivity. Most notably, the largest observed energy gap suggests a critical temperature Tc in the range of 120 K, two orders of magnitude above the previously reported Tc measured via bulk-sensitive methods. The data provide indications that the superconductivity possibly arises out of topological surface states. This would make trigonal PtBi2 a potential candidate for an intrinsic topological superconductor with a Tc above liquid nitrogen temperatures, highlighting it as a promising material for technological applications in quantum computing.
Keywords: Scanning tunneling microscopy; superconductivity; topology; weyl-semimetal; topological superconductivity