# Dual quantum spin Hall insulator by density-tuned correlations in TaIrTe4 https://mdr.nims.go.jp/datasets/71f9ed85-b25a-4e25-949b-026a4dbfbdec ## Files - [2024A00652G_Tang_DualQSH.zip](https://mdr.nims.go.jp/filesets/0184f475-d0fe-4116-91fb-88dbe0cac2b9/download) ([Detail](https://mdr.nims.go.jp/filesets/0184f475-d0fe-4116-91fb-88dbe0cac2b9.md)) ## Id 71f9ed85-b25a-4e25-949b-026a4dbfbdec ## Local identifier ## Visibility open_to_public ## State published ## Created at 2025-09-05T01:37:52.055148Z ## Updated at 2025-09-05T07:30:37.457161Z ## Published at 2025-09-05T07:19:24.987040Z ## Doi ## First published url https://doi.org/10.1038/s41586-024-07211-8 ## Date published 2024-04-18 ## Recorded date published 2024-4-18 ## Resource type journal_article ## Manuscript type accepted_manuscript ## Collection ## Title - title: Dual quantum spin Hall insulator by density-tuned correlations in TaIrTe4 title_type: original lang: en ## Description - description: The convergence of topology and correlations represents a highly coveted realm in the pursuit of novel quantum states of matter. Introducing electron correlations to a quantum spin Hall (QSH) insulator can lead to the emergence of a fractional topological insulator and other exotic time-reversal-symmetric topological order, not possible in quantum Hall and Chern insulator systems. However, the QSH insulator with quantized edge conductance remains rare, let alone that with significant correlations. In this work, we report a novel dual QSH insulator within the intrinsic monolayer crystal of TaIrTe4, arising from the interplay of its single-particle topology and density-tuned electron correlations. At charge neutrality, monolayer TaIrTe4 demonstrates the QSH insulator that aligns with single-particle band structure calculations, manifesting enhanced nonlocal transport and quantized helical edge conductance. Interestingly, upon introducing electrons from charge neutrality, TaIrTe4 only shows metallic behavior in a small range of charge densities but quickly goes into a new insulating state, entirely unexpected based on TaIrTe4's single-particle band structure. This insulating state could arise from a strong electronic instability near the van Hove singularities (VHS), likely leading to a charge density wave (CDW). Remarkably, within this correlated insulating gap, we observe a resurgence of the QSH state, marked by the revival of nonlocal transport and quantized helical edge conduction. Our observation of helical edge conduction in a CDW gap could bridge spin physics and charge orders. The discovery of a dual QSH insulator introduces a new method for creating topological flat minibands via CDW superlattices, which offer a promising platform for exploring time-reversal-symmetric fractional phases and electromagnetism. description_type: abstract lang: en ## Creator - name: Jian Tang role: author - name: Thomas Siyuan Ding role: author - name: Hongyu Chen role: author - name: Anyuan Gao role: author - name: Tiema Qian role: author - name: Zumeng Huang role: author - name: Zhe Sun role: author - name: Xin Han role: author - name: Alex Strasser role: author - name: Jiangxu Li role: author - name: Michael Geiwitz role: author - name: Mohamed Shehabeldin role: author - name: Vsevolod Belosevich role: author - name: Zihan Wang role: author - name: Yiping Wang role: author - name: Kenji Watanabe role: author orcid: https://orcid.org/0000-0003-3701-8119 organization: National Institute for Materials Science - name: Takashi Taniguchi role: author orcid: https://orcid.org/0000-0002-1467-3105 organization: National Institute for Materials Science - name: David C. Bell role: author - name: Ziqiang Wang role: author - name: Liang Fu role: author - name: Yang Zhang role: author - name: Xiaofeng Qian role: author - name: Kenneth S. Burch role: author - name: Youguo Shi role: author - name: Ni Ni role: author - name: Guoqing Chang role: author - name: Su-Yang Xu role: author - name: Qiong Ma role: author ## Contact agent ## Publisher organization: Springer Science and Business Media LLC ## Managing organization ## Keyword - subject: Quantum Spin Hall (QSH) Insulator schema: not_defined - subject: Electron Correlations schema: not_defined - subject: Charge Density Wave (CDW) schema: not_defined ## Rights - description: 'This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: http://dx.doi.org/10.1038/s41586-024-07211-8' identifier: http://rightsstatements.org/vocab/InC/1.0/ ## Other identifier(s) ## Data origin - data_origin_type: other ## Embargo start_date: 2024-03-20 end_date: 2024-09-20 ## Journal - title: Nature issn: '00280836' volume: '628' issue: '8008' start_page: 515 end_page: 521 ## Conference ## Related item ## Funding ## Instrument ## Instrument operator ## Instrument managing organization ## Measurement method ## Specimen ## Chemical composition ## Structure for specimen ## Structural feature for specimen ## Specific property for specimen ## Process for specimen treatment ## Computational method ## Energy level/transition state ## Software ## Custom property ## Fileset - id: '0184f475-d0fe-4116-91fb-88dbe0cac2b9' filename: 2024A00652G_Tang_DualQSH.zip content_type: application/zip size: 9411911 md5: 397ee396866ec865714b8e52ffd13cb0 ## Thumbnail