Stacking-induced type-II quantum spin Hall insulators with high spin Chern number in unconventional magnetism

[2508.05365] Stacking-induced type-II quantum spin Hall insulators with high spin Chern number in unconventional magnetism Skip to main content Search Submit Donate Log in Condensed Matter > Mesoscale and Nanoscale Physics arXiv:2508.05365 (cond-mat) [Submitted on 7 Aug 2025 ( v1 ), last revised 25 Aug 2026 (this version, v2)] Title: Stacking-induced type-II quantum spin Hall insulators with high spin Chern number in unconventional magnetism Authors: Chao-Yang Tan , Panjun Feng , Ze-Feng Gao , Fengjie Ma , Peng-Jie Guo , Zhong-Yi Lu View PDF HTML (experimental) Abstract: While stacking two type-I quantum spin Hall insulators typically results in a trivial insulator, the behavior of the assembly of type-II quantum spin Hall insulators remains unexplored. In this article, based on calculations of a lattice model, we demonstrate that stacking two type-II quantum spin Hall insulators does not yield a trivial insulator but instead forms a nontrivial quantum spin Hall insulator with high spin Chern number. In this phase, two pairs of topological edge states with opposite chirality and polarization coexist at the boundary. Our calculations further reveal that the quantized spin Hall conductivity of the bilayer is twice that of the monolayer. When U(1) symmetry is present, the high spin Chern number phase remains stable; when U(1) symmetry is broken, it persists over a broad parameter range. Furthermore, based on first-principles electronic structure calculations, we demonstrate that bilayer Nb$_2$SeTeO is a type-II quantum spin Hall insulator with a high spin Chern number in altermagnetism and unconventional compensated magnetism. Moreover, extending this strategy to multilayer stacks naturally leads to a quantum spin Hall insulator with a higher spin Chern number. Our work not only deepens the distinction between type-I and type-II quantum spin Hall insulators, but also offers a route toward realizing highly quantized spin Hall conductivity. Comments: 5 pages, 4 figures Subjects: Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ; Materials Science (cond-mat.mtrl-sci) Cite as: arXiv:2508.05365 [cond-mat.mes-hall] (or arXiv:2508.05365v2 [cond-mat.mes-hall] for this version) https://doi.org/10.48550/arXiv.2508.05365 Focus to learn more arXiv-issued DOI via DataCite Journal reference: Science Bulletin 71(2026) 2196-2199 Related DOI : https://doi.org/10.1016/j.scib.2026.04.018 Focus to learn more DOI(s) linking to related resources Submission history From: Chao Yang Tan [ view email ] [v1] Thu, 7 Aug 2025 13:13:04 UTC (5,272 KB) [v2] Tue, 25 Aug 2026 10:07:05 UTC (9,032 KB) Full-text links: Access Paper: View PDF HTML (experimental) view license Current browse context: cond-mat.mes-hall < prev | next > new | recent | 2025-08 Change to browse by: cond-mat cond-mat.mtrl-sci References & Citations SciX Google Scholar Semantic Scholar export BibTeX citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer ( What is the Explorer? ) Connected Papers Toggle Connected Papers ( What is Connected Papers? ) Litmaps Toggle Litmaps ( What is Litmaps? ) scite.ai Toggle scite Smart Citations ( What are Smart Citations? ) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv ( What is alphaXiv? ) Links to Code Toggle CatalyzeX Code Finder for Papers ( What is CatalyzeX? ) DagsHub Toggle DagsHub ( What is DagsHub? ) GotitPub Toggle Gotit.pub ( What is GotitPub? ) Huggingface Toggle Hugging Face ( What is Huggingface? ) ScienceCast Toggle ScienceCast ( What is ScienceCast? ) Demos Demos Replicate Toggle Replicate ( What is Replicate? ) Spaces Toggle Hugging Face Spaces ( What is Spaces? ) Spaces Toggle TXYZ.AI ( What is TXYZ.AI? ) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower ( What are Influence Flowers? ) Core recommender toggle CORE Recommender ( What is CORE? ) IArxiv recommender toggle IArxiv Recommender ( What is IArxiv? ) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them. Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs . Which authors of this paper are endorsers? | Disable MathJax ( What is MathJax? ) We gratefully acknowledge support from our major funders , member institutions , and all contributors. About · Help · Contact · Subscribe · Copyright · Privacy · Accessibility · Operational Status (opens in new tab)

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