{
  "abstract": "Large and electrically controllable spin splitting in nonmagnetic materials is highly desirable for condensed-matter physics and spintronics, enabling strongly spin-polarized quasiparticles and unconventional spin transport as well as their electrical control. Here, we establish a general framework for critical spin-polarized Weyl fermions in two-dimensional (2D) nonmagnetic systems. We predict the $α$-Bi-like Group-V puckered-layer family of 2D ferroelectrics as a material platform combining critical spin-Weyl fermions, giant spin splitting, and electrically switchable nonlinear and spin transport. Our calculations reveal exchange-scale spin splitting induced by spin-orbit coupling and a $p$-wave spin texture in the BiAs monolayer. Moreover, BiAs hosts four critical spin-Weyl points, each formed within a single-spin channel. The nearly quantized $\\langle S_z\\rangle$ is protected by an emergent $S_z$-conservation symmetry in the low-energy limit. The spin-Weyl cones also give rise to unconventional spin-transport phenomena, including a purely out-of-plane Edelstein response and a pronounced spin Nernst effect. Ferroelectric reversal further enables electrical switching of the $p$-wave spin texture and inversion-odd responses, while the tunability of these properties through composition, strain, and magnetic field is also systematically demonstrated across the entire family. These results establish both a general nonmagnetic framework and a promising material platform for exploring critical spin-Weyl physics, nonlinear Hall phenomena, and unconventional spin transport.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.39604",
  "author_total": 6,
  "authors": [
    {
      "name": "Chenhao Liang"
    },
    {
      "name": "Haohao Sheng"
    },
    {
      "name": "Sheng Zhang"
    },
    {
      "name": "Zhong Fang"
    },
    {
      "name": "Hongming Weng"
    },
    {
      "name": "Zhijun Wang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2yc0kc0j7exy9.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.39604",
  "fulltext_url": null,
  "id": "2yc0kc0j7exy9",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.39604",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.mes-hall"
    ],
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.39604",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/2yc0kc0j7exy9.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:36:23Z",
      "native_id": "2610.39604",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.39604"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Spin-Polarized Weyl Fermions and Unconventional Spin Transport",
  "title_text": "Spin-Polarized Weyl Fermions and Unconventional Spin Transport",
  "type": "preprint",
  "updated_at": "2026-11-01T12:20:45Z",
  "url": "https://research.draconitic.com/paper/2yc0kc0j7exy9",
  "venue": "arXiv",
  "versions": []
}