{
  "abstract": "MnF$_2$ is widely regarded as a candidate altermagnet, but the magnitude and implications of its altermagnetic band splitting remain debated. Using electronic-structure calculations, we construct minimal models that capture the magnetic and electronic properties of MnF$_2$. These models show that the parameters governing the chiral magnon splitting and the spin splitting of the electronic bands are relatively small. Moreover, the electronic system lies in the strong-coupling regime, where most magnetic properties are controlled by the ratio $t/U$ between the characteristic hopping amplitude $t$ and the large on-site Coulomb repulsion $U$. Consequently, all exchange interactions scale as $1/U$, so a small altermagnetic hopping $δt$ produces only a proportionally small exchange term. Upon doping, the altermagnetic contribution to the anomalous Hall effect is likewise suppressed, being smaller than the conventional (non-altermagnetic) contribution by a factor of order $δt/U$. In contrast, the behavior of the conductivity tensor $\\hatσ(ω)$ at $\\hbar ω\\sim U$ differs qualitatively, because $δt$ enters the energies of interband optical transitions \\emph{directly} rather than through the reduced ratio $δt/U$. This contribution strongly reshapes $\\hatσ(ω)$, leading to a dramatic enhancement of the magneto-optical response.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2606.01515",
  "author_total": 1,
  "authors": [
    {
      "name": "Igor Solovyev"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/90z4g94v69jeh.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.01515",
  "fulltext_url": null,
  "id": "90z4g94v69jeh",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2606.01515",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ],
    [
      "openalex",
      "3104|Advanced Condensed Matter Physics"
    ]
  ],
  "openalex": "W7163160155",
  "pdf_url": "https://arxiv.org/pdf/2606.01515",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-06",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/90z4g94v69jeh.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:22Z",
      "native_id": "2606.01515",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.01515"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Altermagnetism in MnF$_2$: Band Splitting and Its Physical Consequences",
  "title_text": "Altermagnetism in MnF_2: Band Splitting and Its Physical Consequences",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:22Z",
  "url": "https://research.draconitic.com/paper/90z4g94v69jeh",
  "venue": "arXiv",
  "versions": []
}