J. Besproswanny, S. Schimmel, G. Shipunov, S. Aswartham, Y. Fasano, J. Puig, D. Baumann, R. Vocaturo, J. I. Facio, O. Janson, J. van den Brink, B. Büchner, C. Hess

Intrinsic topological superconductivity holds significant potential for applications in quantum computation, alongside a range of other technological and scientific uses. Trigonal PtBi2 is a promising candidate: it has been established as a topological Weyl semimetal through ARPES and scanning tunneling microscopy and spectroscopy (STM/STS) measurements [1,2]. In addition, it exhibits unconventional surface superconductivity, evidenced by an energy gap observed in low-temperature STS [3].
This poster provides an overview of the superconducting and topological properties probed by STS, revealing sample-dependent gap sizes, critical fields, and transition temperatures. The largest observed energy gaps suggest critical temperatures as high as 70–130 K when estimated within BCS theory [3]. Direct measurements of the temperature dependence further indicate possible superconducting fluctuations persisting up to 45 K. Finally, evidence for an interplay between topological Fermi arcs and superconductivity is presented based on ARPES [1,4] and quasiparticle interference (QPI) investigations.

[1] S. Hoffmann et. al.; Adv. Phys. Res. 2400150 (2024)
[2] A. Kuibarov et. al.; nature 626, 294-299 (2024)
[3] S. Schimmel et. al.; nature communications 15, 9895 (2024)
[4] S. Changdar et. al.; nature 647, 613-618 (2025)