{
  "abstract": "Identifying the spatial rank of higher-wave altermagnetic order optically is challenging because local electric-dipole response does not uniquely resolve distinct continuum harmonics. We show that finite photon momentum turns one-photon spin-resolved absorption into a rank-selective tomography. For the planar $|m|=\\ell$ sector of an even-parity $\\ell$-wave component, a joint Fourier projection in polarization and momentum angle isolates $\\mathcal T_\\ell\\proptoη_\\ell q^{\\ell-2}$, yielding the hierarchy $d:q^0$, $g:q^2$, and $i:q^4$; phase changes track rotations of the selected magnetic harmonic. A Ward-consistent finite-$q$ microscopic calculation reproduces these powers without imposing them. Although discrete crystal symmetry can generate lower-order local aliases, they are orthogonal to the selected momentum harmonic and cannot contaminate it below $q^{\\ell-2}$. In MnTe, whose nonrelativistic parent order is three-dimensional $g$ wave while spin--orbit coupling lowers the exact relativistic spin-momentum-locking symmetry, first-principles calculations show that more than $99.9\\%$ of the Fourier power of the Néel-projected $A$-region spin-energy contrast remains in the parent $g$-wave-derived $m=3$ harmonic. Structured near fields place the required momentum window within experimental reach.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.02429",
  "author_total": 3,
  "authors": [
    {
      "name": "Meysam Bagheri Tagani"
    },
    {
      "name": "Carmine Autieri"
    },
    {
      "name": "Sahar Izadi Vishkayi"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/ey9f7083tezr1.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.02429",
  "fulltext_url": null,
  "id": "ey9f7083tezr1",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.02429",
  "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.mes-hall"
    ],
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ],
    [
      "openalex",
      "3107|Magnetic properties of thin films"
    ]
  ],
  "openalex": "W7207861574",
  "pdf_url": "https://arxiv.org/pdf/2609.02429",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-02",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/ey9f7083tezr1.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:16Z",
      "native_id": "2609.02429",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.02429"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Rank-Selective Optical Tomography of Higher-Wave Altermagnetism",
  "title_text": "Rank-Selective Optical Tomography of Higher-Wave Altermagnetism",
  "type": "preprint",
  "updated_at": "2026-10-30T12:18:16Z",
  "url": "https://research.draconitic.com/paper/ey9f7083tezr1",
  "venue": "arXiv",
  "versions": []
}