{
  "abstract": "Type-IV two-dimensional (2D) magnetism-a newly classified collinear magnetic phase featuring nonrelativistic spin degeneracy and spin-orbit-coupling-induced momentum-dependent spin splitting-extends the symmetry classification of collinear magnets, opening new opportunities for unconventional topological quantum states. Here, we reveal that the recently proposed two-dimensional type-IV 2D magnet MgCr$_2$O$_4$ hosts an intrinsic higher-order topological insulating phase, featuring $\\mathcal{C}_{3z}$-protected corner states and a nontrivial rotational topological invariant of $χ^{(3)}$ = $\\{-2,4\\}$ with a quantized fractional corner charge of $4e/3$. Spin-orbit coupling breaks the spin-degeneracy-enforcing symmetry $[C_{2}||M_z]$ while preserving the crystalline $\\mathcal{C}_{3z}$ rotational symmetry that protects the higher-order topological phase, thereby enabling spin splitting to coexist with the nontrivial topology. Furthermore, the higher-order topological phase remains intact throughout a wide range of biaxial strains without band-gap closing and topological phase transition, demonstrating the robustness of the symmetry-protected topological state against external perturbations. Our work establishes a direct connection between type-IV magnetic system and higher-order topology, providing a new route for symmetry-engineered magnetic topological quantum states.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.27918",
  "author_total": 7,
  "authors": [
    {
      "name": "Xiaorong Zou"
    },
    {
      "name": "Hyeon Suk Shin"
    },
    {
      "name": "Yanmei Zang"
    },
    {
      "name": "Ying Dai"
    },
    {
      "name": "Chengwang Niu"
    },
    {
      "name": "Chang-Jong Kang"
    },
    {
      "name": "Chang Woo Myung"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bxzyrk7e40997.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.27918",
  "fulltext_url": null,
  "id": "bxzyrk7e40997",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.27918",
  "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",
      "physics.comp-ph"
    ],
    [
      "openalex",
      "3107|Topological Materials and Phenomena"
    ]
  ],
  "openalex": "W7204774108",
  "pdf_url": "https://arxiv.org/pdf/2608.27918",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/bxzyrk7e40997.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:22Z",
      "native_id": "2608.27918",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.27918"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.comp-ph",
      "subfield": "computational"
    }
  ],
  "title": "Higher-Order Topological Phase in the Two-Dimensional Type-IV Magnet MgCr$_2$O$_4$",
  "title_text": "Higher-Order Topological Phase in the Two-Dimensional Type-IV Magnet MgCr_2O_4",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:22Z",
  "url": "https://research.draconitic.com/paper/bxzyrk7e40997",
  "venue": "arXiv",
  "versions": []
}