# Correlated topological flat bands in rhombohedral graphite https://mdr.nims.go.jp/datasets/c13164f5-420c-4a60-a040-512c54c3cd5e ## File - [zhang-et-al-2024-correlated-topological-flat-bands-in-rhombohedral-graphite.pdf](https://mdr.nims.go.jp/filesets/a49ebc4c-4803-462b-99e2-ff8a17e1d068/download) ([Detail](https://mdr.nims.go.jp/filesets/a49ebc4c-4803-462b-99e2-ff8a17e1d068.md)) ## Id c13164f5-420c-4a60-a040-512c54c3cd5e ## Local identifier ## Visibility open_to_public ## State published ## Created at 2025-02-05T00:08:03.676620Z ## Updated at 2025-02-05T03:31:25.788934Z ## Published at 2025-02-05T03:31:25.872043Z ## Doi ## First published url https://doi.org/10.1073/pnas.2410714121 ## Date published 2024-10-22 ## Recorded date published 2024-10-22 ## Resource type journal_article ## Manuscript type vor ## Collection ## Title - title: Correlated topological flat bands in rhombohedral graphite title_type: original lang: en ## Description - description: Flat bands and non-trivial topological physics are two important topics for condensed matter physics over the past decade. While flat bands can lead to emergent properties such as superconductivity, correlated insulating state etc, non-trivial band topology can give rise to topologically protected surface or edge states. With a unique stacking configuration analogous to the Su-Schrieffer-Heeger (SSH) model, rhombohedral graphite (RG) is a promising candidate for realizing both flat bands and nontrivial topological physics. Here we report experimental evidence of topological flat bands on the surface of bulk RG, which are protected by bulk spiral Dirac nodal lines via the bulk-boundary correspondence. Moreover, upon in situ electron doping, the degeneracy of the flat bands is spontaneously lifted, with an order- of-magnitude increase in the bandwidth of the lower split band. Hartree-Fock calculations support spontaneous flavor symmetry breaking under doping but fail to explain other observations such as the pinning of flat bands near the Fermi level, which suggests that correlation effects beyond mean-field theory are important in this system. Our work establishes RG as a spiral Dirac nodal line semimetal with topological surface flat bands and exotic correlation effects, providing a new platform for investigating the rich interplay between nontrivial band topology and interaction-driven symmetry-broken states. description_type: abstract lang: und ## Creator - name: Hongyun Zhang role: author orcid: https://orcid.org/0000-0002-0993-8949 - name: Qian Li role: author orcid: https://orcid.org/0000-0003-1452-7121 - name: Michael G. Scheer role: author orcid: https://orcid.org/0000-0003-0798-6135 - name: Renqi Wang role: author orcid: https://orcid.org/0009-0008-8682-0531 - name: Chuyi Tuo role: author - name: Nianlong Zou role: author - name: Wanying Chen role: author - name: Jiaheng Li role: author - name: Xuanxi Cai role: author orcid: https://orcid.org/0009-0004-6444-9541 - name: Changhua Bao role: author orcid: https://orcid.org/0000-0002-8706-6541 - name: Ming-Rui Li role: author - name: Ke Deng role: author orcid: https://orcid.org/0000-0001-5656-8867 - name: Kenji Watanabe role: author orcid: https://orcid.org/0000-0003-3701-8119 - name: Takashi Taniguchi role: author orcid: https://orcid.org/0000-0002-1467-3105 - name: Mao Ye role: author - name: Peizhe Tang role: author orcid: https://orcid.org/0000-0002-6345-5809 - name: Yong Xu role: author - name: Pu Yu role: author orcid: https://orcid.org/0000-0002-5513-7632 - name: Jose Avila role: author orcid: https://orcid.org/0000-0003-1027-5676 - name: Pavel Dudin role: author orcid: https://orcid.org/0000-0002-5971-0395 - name: Jonathan D. Denlinger role: author orcid: https://orcid.org/0000-0001-7645-1631 - name: Hong Yao role: author - name: Biao Lian role: author - name: Wenhui Duan role: author orcid: https://orcid.org/0000-0001-9685-2547 - name: Shuyun Zhou role: author orcid: https://orcid.org/0000-0002-9841-8610 ## Contact agent ## Publisher organization: Proceedings of the National Academy of Sciences ## Managing organization ## Keyword - subject: Flat bands schema: not_defined - subject: topological physics schema: not_defined - subject: rhombohedral graphite schema: not_defined ## Rights - identifier: https://creativecommons.org/licenses/by-nc-nd/4.0/ ## Other identifier(s) ## Data origin - data_origin_type: other ## Embargo ## Journal - title: Proceedings of the National Academy of Sciences issn: '00278424' volume: '121' issue: '43' ## Conference ## Related item ## Funding - identifier: '12234011' funder_name: The National Natural Science Foundation of China - identifier: 2021YFA1400100 funder_name: The National Key&D Program of China - identifier: '52388201' funder_name: The National Natural Science Foundation of China - identifier: DMR-2011750 funder_name: National Science Foundation through Princeton University's Materials Research Science and Engineering Center - identifier: '52025024' funder_name: The National Natural Science Foundation of China - identifier: 2022M721887 funder_name: China Postdoctoral Science Foundation - identifier: '12304226' funder_name: National Natural Science Foundation of China ## 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: a49ebc4c-4803-462b-99e2-ff8a17e1d068 filename: zhang-et-al-2024-correlated-topological-flat-bands-in-rhombohedral-graphite.pdf content_type: application/pdf size: 9973684 md5: d660d0a3c71c144b3fce5312b914dd5e ## Thumbnail fileset_id: a49ebc4c-4803-462b-99e2-ff8a17e1d068 filename: zhang-et-al-2024-correlated-topological-flat-bands-in-rhombohedral-graphite.pdf