{
  "abstract": "The functional quantum spin Hall insulators (QSHI), protected by time-reversal symmetry against single-particle backscattering, hold great promise for dissipationless quantum electronics. Realization of QSHI with gapped helical edge states, which would enable deterministic on/off switching of the edge-channel conductance, is a key requirement for programmable topological circuits. Here, we report realization of superlattice-modulated QSHI HfTe5 hosting emergent multigap-like helical edge states. Using scanning tunneling microscopy and spectroscopy, we identify a reconstruction-induced periodic superlattice modulation in epitaxial monolayer HfTe5 and directly observe multiple gap-like features in the edge channel, accompanied by a series of sharp peaks in the density of states. Combined with theoretical modelling, we attribute the observed edge gap to the finite-width coupling between the two edges significantly enhanced by the superlattice modulation, whereas the sharp peaks are the manifestations of mini-gaps opening at the reduced Brillouin zone boundaries by the periodic modulation of spin-orbit coupling. Notably, these sharp peaks exhibit clear Zeeman splitting under magnetic fields, consistent with the helical nature of the topological edge states. Our results establish a viable route to engineering gapped helical edge states in QSHI and provide a promising platform for topological devices with desired on/off switchability.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Advanced Materials, e75159 (2026)",
  "arxiv": "2609.25732",
  "author_total": 18,
  "authors": [
    {
      "name": "Hui Guo"
    },
    {
      "name": "Xianghe Han"
    },
    {
      "name": "Fang Qin"
    },
    {
      "name": "Xiaoshuai Fu"
    },
    {
      "name": "Hao Peng"
    },
    {
      "name": "Hongqin Xiao"
    },
    {
      "name": "Hengxin Tan"
    },
    {
      "name": "Chen Liu"
    },
    {
      "name": "Zihao Huang"
    },
    {
      "name": "Jiayi Wang"
    },
    {
      "name": "Qian Fang"
    },
    {
      "name": "Rui Chen"
    },
    {
      "name": "Haitao Yang"
    },
    {
      "name": "Wang Yao"
    },
    {
      "name": "Li Huang"
    },
    {
      "name": "Hai-Zhou Lu"
    },
    {
      "name": "Hui Chen"
    },
    {
      "name": "Hong-Jun Gao"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/948ab1230qba1.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.25732",
  "fulltext_url": null,
  "id": "948ab1230qba1",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.25732",
  "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.mtrl-sci"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.25732",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-07",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/948ab1230qba1.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:37Z",
      "native_id": "2609.25732",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.25732"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Realization of quantum spin Hall insulator superlattice with emergent multigap-like helical edge states",
  "title_text": "Realization of quantum spin Hall insulator superlattice with emergent multigap-like helical edge states",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:37Z",
  "url": "https://research.draconitic.com/paper/948ab1230qba1",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1002/adma.75159",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}