{
  "abstract": "Universal conductance fluctuations are conventionally organized by symmetry class, but crystalline anisotropy introduces additional structure in spin transport. Here we demonstrate orientation-dependent universal spin-transport fluctuations in disordered two-dimensional $d$-wave altermagnets without spin-orbit coupling. Rotating the altermagnetic orientation changes both longitudinal spin-conductance and transverse spin-Hall conductance fluctuations, while each conserved-spin sector remains in class AI. Altermagnetic orientation controls both the fluctuation amplitudes and the development of disorder-insensitive plateaus. These plateaus become flatter and less sensitive to the altermagnetic strength over the studied parameter ranges as the orientation approaches $45^\\circ$, with representative fluctuation amplitudes of approximately $0.60e/(4π)$ for the longitudinal spin conductance and $0.40\\,e/(4π)$ for the spin-Hall conductance. The longitudinal fluctuation amplitude correlates strongly with anisotropy of the clean-band Fermi-velocity tensor. Spin-sector covariances explain how the conserved channels combine into total fluctuations. Our results extend anisotropy-sensitive universal-fluctuation physics to conserved-spin altermagnetic transport and establish crystalline orientation as a control parameter within a fixed symmetry class.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.19793",
  "author_total": 6,
  "authors": [
    {
      "name": "Yihan Zhang"
    },
    {
      "name": "Zheng Qin"
    },
    {
      "name": "Donghui Xu"
    },
    {
      "name": "Junjie Zeng"
    },
    {
      "name": "Zhen Ning"
    },
    {
      "name": "Rui Wang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/edk7hxypma2eb.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.19793",
  "fulltext_url": null,
  "id": "edk7hxypma2eb",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.19793",
  "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.mes-hall"
    ],
    [
      "openalex",
      "3107|Quantum and electron transport phenomena"
    ]
  ],
  "openalex": "W7221913323",
  "pdf_url": "https://arxiv.org/pdf/2610.19793",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-20",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/edk7hxypma2eb.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:04Z",
      "native_id": "2610.19793",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.19793"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Orientation-Dependent Universality of Spin-Transport Fluctuations in Two-Dimensional Altermagnets",
  "title_text": "Orientation-Dependent Universality of Spin-Transport Fluctuations in Two-Dimensional Altermagnets",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:04Z",
  "url": "https://research.draconitic.com/paper/edk7hxypma2eb",
  "venue": "arXiv",
  "versions": []
}