Robust Two-Dimensional Surface Superconductivity and Vortex Lattice in the Weyl Semimetal γ − PtBi 2
Year: 2026
Type: article
Abstract: The layered compound γ-PtBi_{2} 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 T_{C}=2.9 K and H_{C2}≈1.8 T linked to the Fermi arcs. We observe quantized superconducting vortices and the Josephson effect, demonstrating two-dimensional macroscopic quantum phase coherence.
Source: Physical Review Letters
DOI: 10.1103/9cyw-m5zr
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,750
OpenAlex ID: W7166517230