{
  "abstract": "Altermagnets combine the vanishing net magnetization of antiferromagnets with momentum-dependent spin splitting. Magnon band splitting provides a direct probe of altermagnetic order and may enable chirality-selective magnon transport, yet the momentum-space symmetry of this splitting has not been determined quantitatively. Here we use inelastic neutron scattering to map the momentum dependence of altermagnetic magnon splitting in hematite ($α$-Fe$_2$O$_3$). The splitting vanishes along nodal directions and reaches maxima off the nodes, revealing the $g$-wave symmetry of the altermagnetic order parameter. These results agree with linear spin-wave theory calculations based on the altermagnetic model, which further identify the nondegenerate branches as magnons of opposite chirality and trace the splitting to symmetry-inequivalent long-range exchange interactions. Our results provide the first quantitative determination of the momentum-space symmetry of altermagnetic chiral magnons. These findings, together with hematite's high magnetic ordering temperature and low magnon damping, establish it as a promising platform for low-dissipation, symmetry-selective magnonic applications.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.08693",
  "author_total": 14,
  "authors": [
    {
      "name": "Tianren Wang"
    },
    {
      "name": "Yuehong Li"
    },
    {
      "name": "Yu Feng"
    },
    {
      "name": "Andong Liu"
    },
    {
      "name": "Yuetong Wu"
    },
    {
      "name": "Qian Zhao"
    },
    {
      "name": "Yujie Yan"
    },
    {
      "name": "Wei Luo"
    },
    {
      "name": "Xin Tong"
    },
    {
      "name": "Yi Lu"
    },
    {
      "name": "Yao Shen"
    },
    {
      "name": "Stefano Agrestini"
    },
    {
      "name": "Jaewon Choi"
    },
    {
      "name": "Qisi Wang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5eat1dhqm2gmf.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.08693",
  "fulltext_url": null,
  "id": "5eat1dhqm2gmf",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.08693",
  "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.mtrl-sci"
    ],
    [
      "arxiv",
      "cond-mat.str-el"
    ],
    [
      "openalex",
      "3104|Advanced Condensed Matter Physics"
    ]
  ],
  "openalex": "W7212067543",
  "pdf_url": "https://arxiv.org/pdf/2609.08693",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-08",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/5eat1dhqm2gmf.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:52Z",
      "native_id": "2609.08693",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.08693"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "$g$-wave altermagnetic order parameter in hematite",
  "title_text": "g-wave altermagnetic order parameter in hematite",
  "type": "preprint",
  "updated_at": "2026-10-30T12:19:52Z",
  "url": "https://research.draconitic.com/paper/5eat1dhqm2gmf",
  "venue": "arXiv",
  "versions": []
}