Peer-reviewedCC BY 4.0Physical Review Letters
Robust Two-Dimensional Surface Superconductivity and Vortex Lattice in the Weyl Semimetal y−PtBi2
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 ¼ 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.
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BibTeX
@article{moreno2026robust,
title = {{Robust Two-Dimensional Surface Superconductivity and Vortex Lattice in the Weyl Semimetal y−PtBi2}},
author = {Jose Antonio Moreno and Pablo García Talavera and Edwin Herrera and Sara López Valle and Zhuoqi Li and Lin-Lin Wang and Sergey Bud’ko and Alexander I Buzdin and Isabel Guillamón and Paul C Canfield and Hermann Suderow},
journal = {Physical Review Letters},
year = {2026},
month = aug,
doi = {10.1103/9cyw-m5zr},
eprint = {2508.04867},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05763406v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Robust Two-Dimensional Surface Superconductivity and Vortex Lattice in the Weyl Semimetal y−PtBi2
AU - Jose Antonio Moreno
AU - Pablo García Talavera
AU - Edwin Herrera
AU - Sara López Valle
AU - Zhuoqi Li
AU - Lin-Lin Wang
AU - Sergey Bud’ko
AU - Alexander I Buzdin
AU - Isabel Guillamón
AU - Paul C Canfield
AU - Hermann Suderow
PY - 2026
DA - 2026/08/17
JO - Physical Review Letters
DO - 10.1103/9cyw-m5zr
UR - https://hal.science/hal-05763406v1
AB - 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 ¼ 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.
SN - 0031-9007
SN - 1079-7114
ER -