{
  "abstract": "Topological wave systems have largely evolved along two distinct paradigms: gapless topological semimetals and gapped topological insulators. While topological semimetals support bulk transport, they generally lack intrinsic selectivity among propagation channels; topological insulators enable robust transport but confine it to narrow interfaces, limiting spatial utilization. Here, we theoretically demonstrate and experimentally realize time-reversal-invariant spin-valley photonic half-semimetals (HSMs), which exhibit a dual semimetal-insulator topology within a single bulk band structure. In HSMs, the bandgap closes selectively in spin-valley space: for a given spin (valley), one valley (spin) is semimetallic while the other remains insulating. This coexistence of spin- and valley-resolved gapless and gapped band structures makes HSMs fundamentally distinct from both conventional semimetals and insulators. As a defining bulk phenomenon, an HSM functions as a spin-valley-locked beam splitter, intrinsically enabling valley-selective spin routing. Moreover, when four complementary HSMs are assembled into a periodic superlattice, the same dual topology enables reciprocal spin-valley-resolved multilane helical transport with 100% spatial utilization. These results establish HSMs as a platform for selective bulk wave control and multichannel topological transport beyond conventional topological phases.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.25596",
  "author_total": 9,
  "authors": [
    {
      "name": "Zi-Xuan Gao"
    },
    {
      "name": "Xiaohan Cui"
    },
    {
      "name": "Xiao-Dong Chen"
    },
    {
      "name": "Ke-Yi Zeng"
    },
    {
      "name": "Hao-Chang Mo"
    },
    {
      "name": "Xin-Tao He"
    },
    {
      "name": "Ruo-Yang Zhang"
    },
    {
      "name": "C. T. Chan"
    },
    {
      "name": "Jian-Wen Dong"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/89ghbj1dd3v94.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.25596",
  "fulltext_url": null,
  "id": "89ghbj1dd3v94",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.25596",
  "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.optics"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.25596",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-22",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/89ghbj1dd3v94.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:39Z",
      "native_id": "2609.25596",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.25596"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Photonic half-semimetals with dual semimetal-insulator topology",
  "title_text": "Photonic half-semimetals with dual semimetal-insulator topology",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:39Z",
  "url": "https://research.draconitic.com/paper/89ghbj1dd3v94",
  "venue": "arXiv",
  "versions": []
}