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PreprintarXiv licencearXiv

A minimal model for the Weyl nodes and Fermi arcs of PtBi2

  • Tobias Cristófoli
  • Manuel Alonso Lemos
  • Jorge I. Facio
  • Pablo S. Cornaglia
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Abstract

Weyl semimetals host topologically protected Fermi arcs on their surfaces, originating from the Chern number of the bulk Weyl nodes. In trigonal PtBi2, superconducting signatures have been associated with the Fermi arcs. Theoretical descriptions of this surface superconductivity have so far relied on effective models that are not directly tied to the microscopic electronic structure of the material. In this work we develop a minimal description of the low-energy bands guided by density functional theory calculations and fully constrained by the relevant crystalline and time-reversal symmetries. The model captures the evolution of the Weyl nodes with spin-orbit coupling, including node annihilations, and is able to describe the spin-momentum locking of the surface Fermi arcs. It reproduces the orbital content and the band topology of PtBi2 and provides a starting point for further studies.

Versions

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Cite

BibTeXRIS
BibTeX
@misc{cristofoli2026minimal,
  title = {{A minimal model for the Weyl nodes and Fermi arcs of PtBi$_2$}},
  author = {Tobias Cristófoli and Manuel Alonso Lemos and Jorge I. Facio and Pablo S. Cornaglia},
  howpublished = {arXiv},
  year = {2026},
  month = jul,
  doi = {10.48550/arxiv.2607.10937},
  eprint = {2607.10937},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2607.10937},
}
RIS
TY  - UNPB
TI  - A minimal model for the Weyl nodes and Fermi arcs of PtBi_2
AU  - Tobias Cristófoli
AU  - Manuel Alonso Lemos
AU  - Jorge I. Facio
AU  - Pablo S. Cornaglia
PY  - 2026
DA  - 2026/07/12
PB  - arXiv
DO  - 10.48550/arxiv.2607.10937
UR  - https://arxiv.org/abs/2607.10937
AB  - Weyl semimetals host topologically protected Fermi arcs on their surfaces, originating from the Chern number of the bulk Weyl nodes. In trigonal PtBi_2, superconducting signatures have been associated with the Fermi arcs. Theoretical descriptions of this surface superconductivity have so far relied on effective models that are not directly tied to the microscopic electronic structure of the material. In this work we develop a minimal description of the low-energy bands guided by density functional theory calculations and fully constrained by the relevant crystalline and time-reversal symmetries. The model captures the evolution of the Weyl nodes with spin-orbit coupling, including node annihilations, and is able to describe the spin-momentum locking of the surface Fermi arcs. It reproduces the orbital content and the band topology of PtBi_2 and provides a starting point for further studies.
ER  -