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Robust Two-Dimensional Surface Superconductivity and Vortex Lattice in the Weyl Semimetal γ−PtBi2

Jose Antonio Moreno1, Pablo García Talavera1, Edwin Herrera1, Sara López Valle1, Zhuoqi Li2,3, Lin-Lin Wang2,3, Sergey Bud’ko2,3, Alexander I. Buzdin4, Isabel Guillamón1 et al.

Paul C. Canfield2,3 and Hermann Suderow1

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Phys. Rev. Lett. 137, 086001 – Published 17 August, 2026

DOI: https://doi.org/10.1103/9cyw-m5zr

Abstract

The layered compound γ−PtBi2 is a topological semimetal with Fermi arcs at the surface joining bulk Weyl points. Recent work has found signatures of surface superconductivity consisting of gap openings compatible with a critical temperature orders of magnitude larger than the bulk value. However, no superconducting vortices have been identified, raising questions about the robustness of the phase coherence. Here, we use very low temperature STM and find robust superconductivity with TC=2.9  K and HC2≈1.8  T linked to the Fermi arcs. We observe quantized superconducting vortices and the Josephson effect, demonstrating two-dimensional macroscopic quantum phase coherence.

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Outline

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Phys. Rev. Lett. 137, 086001– Published 17 August, 2026
  • Received 5 August 2025
  • Revised 20 February 2026
  • Accepted 29 June 2026
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