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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 Hess11University 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

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