{
  "abstract": "Every crystal surface breaks inversion symmetry even when the bulk is centrosymmetric, creating an intrinsic boundary polarity ($\\mathbf{\\mathit{P}}$). Here we show that this polarity enables zero-field nonreciprocal transport in the centrosymmetric kagome magnets TbMn$_6$Sn$_{6-x}$In$_x$. In symmetric TbMn$_6$Sn$_{4.4}$In$_{1.6}$ microdevices, opposing side surfaces exhibit second-harmonic longitudinal resistances of comparable magnitude and opposite sign. Reversing the spontaneous magnetization ($\\mathbf{\\mathit{M}}$) reverses both signals, whereas rotating $\\mathbf{\\mathit{M}}$ so that the toroidal moment $\\mathbf{\\mathit{P}} \\times \\mathbf{\\mathit{M}}$ has no component along the current suppresses the response. In pristine TbMn$_6$Sn$_6$, the signal switches off across the spin-reorientation transition, providing a chemically ordered control of the same symmetry relation. Spatial potential mapping indicates that the nonlinear boundary contribution is distinct from the bulk linear conduction. Spin-orbit-coupled surface states associated with topological bands may enhance the effect. Crystal-surface polarity therefore offers a broadly applicable route to zero-field rectification in centrosymmetric magnetic conductors around room temperature.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.34312",
  "author_total": 6,
  "authors": [
    {
      "name": "Daiki Yamaguchi"
    },
    {
      "name": "Max T. Birch"
    },
    {
      "name": "Hibiki Onodera"
    },
    {
      "name": "Akiko Kikkawa"
    },
    {
      "name": "Naoto Nagaosa"
    },
    {
      "name": "Yoshinori Tokura"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/fzyn4vgtys363.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.34312",
  "fulltext_url": null,
  "id": "fzyn4vgtys363",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.34312",
  "language": null,
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ],
    [
      "openalex",
      "3107|Magnetic properties of thin films"
    ]
  ],
  "openalex": "W7223961925",
  "pdf_url": "https://arxiv.org/pdf/2610.34312",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-25",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/fzyn4vgtys363.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:35Z",
      "native_id": "2610.34312",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.34312"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Crystal-surface polarity enables nonreciprocal transport in a centrosymmetric kagome magnet",
  "title_text": "Crystal-surface polarity enables nonreciprocal transport in a centrosymmetric kagome magnet",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:35Z",
  "url": "https://research.draconitic.com/paper/fzyn4vgtys363",
  "venue": "arXiv",
  "versions": []
}