{
  "abstract": "Synthetic frequency dimensions provide a powerful and highly reconfigurable platform for topological photonics. However, experimentally identifying their topological phases remains challenging because these systems do not naturally provide well-defined boundaries or readily accessible edge-state signatures. Here, we realize a reconfigurable Su-Schrieffer-Heeger (SSH) lattice in a synthetic frequency dimension using an integrated thin-film lithium-niobate photonic molecule and directly measure its topology. Electro-optic coupling between staggered resonator supermodes enables independent control of the effective intra-cell and inter-cell hopping strengths, enabling dynamic switching between trivial and non-trivial topological phases on the same chip. We validate the transition through two independently derived bulk topological invariants: direct retrieval of Zak phase from time-resolved synthetic-dimension band-structure spectroscopy; and extraction of the winding number using mean-chiral-displacement method from site-resolved steady-state measurements. Both approaches consistently identify the topological transition and agree closely with theoretical predictions. Our results demonstrate experimentally accessible, boundary-independent methods for characterizing topology in synthetic-frequency lattices. More broadly, the integrated and dynamically reconfigurable photonic platform provides a scalable framework for bulk topological characterization and programmable topological photonic systems.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.21440",
  "author_total": 6,
  "authors": [
    {
      "name": "Hiep Xuan Dinh"
    },
    {
      "name": "Armandas Balčytis"
    },
    {
      "name": "Guanghui Ren"
    },
    {
      "name": "Mei Xian Low"
    },
    {
      "name": "Arnan Mitchell"
    },
    {
      "name": "Thach G. Nguyen"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/cvzth20e55t8c.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.21440",
  "fulltext_url": null,
  "id": "cvzth20e55t8c",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.21440",
  "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",
      "physics.optics"
    ],
    [
      "openalex",
      "3107|Topological Materials and Phenomena"
    ]
  ],
  "openalex": "W7213877222",
  "pdf_url": "https://arxiv.org/pdf/2609.21440",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-18",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/cvzth20e55t8c.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:03Z",
      "native_id": "2609.21440",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.21440"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Topological characterization of a reconfigurable synthetic-frequency SSH lattice on an integrated lithium-niobate platform",
  "title_text": "Topological characterization of a reconfigurable synthetic-frequency SSH lattice on an integrated lithium-niobate platform",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:03Z",
  "url": "https://research.draconitic.com/paper/cvzth20e55t8c",
  "venue": "arXiv",
  "versions": []
}