Dresden 2026 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 11: PtBi₂

TT 11.3: Talk

Monday, March 9, 2026, 11:45–12:00, CHE/0091

Low-temperature scanning tunneling spectroscopy on the superconducting Weyl semimetal t-PtBi₂ — •Sebastian Schimmel¹, Julia Besproswanny¹, Xiaochun Huang², Yanina Fasano³, Grigory Shipunov⁴, Victor Felix Correa³, José Zabala³, Luminita Harnagea⁵, Sven Hoffmann¹, Bernd Büchner⁵, Matthias Bode², and Christian Heß¹ — ¹Universität Wuppertal, 42119, Wuppertal, Germany — ²Universität Würzburg, 97074 Würzburg, Germany — ³Centro Atómico Bariloche and Instituto Balseiro,8400, Bariloche, Argentina — ⁴University of Amsterdam, 1098 XH Amsterdam, The Netherlands — ⁵IFW Dresden, 01069, Dresden, Germany

Combining a topologically non-trivial Weyl semimetal nature and surface superconductivity with T_c > 5 K, trigonal PtBi₂ (t-PtBi₂) is a fascinating representative of quantum materials. Intriguingly, large superconducting gaps, comparable to those known from high-T_c superconductors, suggest elevated transition temperatures, and ARPES revealed that the surface superconductivity is confined to Weyl Fermi arcs exhibiting unconventional i-wave symmetry [1,2]. Via low-temperature scanning tunneling spectroscopy, we experimentally address the local electronic properties of the surface of t-PtBi₂. Here we report on the temperature dependence of the surface superconductivity and peculiar spectroscopic signatures of its spacially varying electronic structures. The presented results corroborate the unconventional non-trivial electronic properties of t-PtBi₂.
[1] A. Kuibarov et al., Nature(2024)
[2] S. Changdar et al., Nature(2025)

Keywords: Superconductivity; Scanning tunneling spectroscopy; Weyl semimetal; Topological superconductivity; unconventional superconductivity