{
  "abstract": "Quantized vortices are ubiquitous in physics, spanning superconductivity, astrophysics, superfluid condensed matter systems, and nonlinear optics. Yet embedding vorticity into topologically protected nonlinear states has remained a major challenge, with all previously observed corner solitons in higher-order topological insulators (HOTIs) exhibiting only trivial phase distributions. Here, we report on the first realization of stable topological corner vortex solitons in a photonic fractal HOTI. Using an array of laser-written waveguides in the shape of Sierpiński gasket with a controllable distortion, we design linear topological vortex modes, from which nonlinear corner vortex solitons bifurcate. Moreover, we demonstrate that these solitons exhibit exceptional robustness across a broad power range and, unlike vortex solitons in topologically trivial lattices, form without a power threshold. Our results introduce the angular momentum degree of freedom into the physics of topological corner modes, opening prospects for topologically protected vortex-based photonics.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Science Bulletin 71, 3875-3880 (2026)",
  "arxiv": "2609.08344",
  "author_total": 15,
  "authors": [
    {
      "name": "Yiqi Zhang"
    },
    {
      "name": "Alexander V. Kireev"
    },
    {
      "name": "Victor O. Kompanets"
    },
    {
      "name": "Sergey Y. Alyatkin"
    },
    {
      "name": "Nikita S. Kostyuchenko"
    },
    {
      "name": "Sergei A. Zhuravitskii"
    },
    {
      "name": "Nikolay N. Skryabin"
    },
    {
      "name": "Khalil Sabour"
    },
    {
      "name": "Alexander A. Kalinkin"
    },
    {
      "name": "Yongdong Li"
    },
    {
      "name": "Sergei P. Kulik"
    },
    {
      "name": "Pavlos G. Lagoudakis"
    },
    {
      "name": "Sergey V. Chekalin"
    },
    {
      "name": "Yaroslav V. Kartashov"
    },
    {
      "name": "Victor N. Zadkov"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6prtk3ddgr7pj.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.08344",
  "fulltext_url": null,
  "id": "6prtk3ddgr7pj",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.08344",
  "language": null,
  "licence": "CC0-1.0",
  "licence_label": "CC0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/publicdomain/zero/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "nlin.PS"
    ],
    [
      "arxiv",
      "physics.optics"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.08344",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-08",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/6prtk3ddgr7pj.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:49Z",
      "native_id": "2609.08344",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.08344"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    },
    {
      "field": "physics",
      "origin": "arxiv:nlin.PS",
      "subfield": "statistical-nonlinear"
    }
  ],
  "title": "Thresholdless corner vortex solitons in fractal Sierpiński topological insulators",
  "title_text": "Thresholdless corner vortex solitons in fractal Sierpiński topological insulators",
  "type": "preprint",
  "updated_at": "2026-10-30T12:19:49Z",
  "url": "https://research.draconitic.com/paper/6prtk3ddgr7pj",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1016/j.scib.2026.06.052",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}