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  Correlated topological flat bands in rhombohedral graphite

Zhang, H., Li, Q., Scheer, M. G., Wang, R., Tuo, C., Zou, N., et al. (2024). Correlated topological flat bands in rhombohedral graphite. Proceedings of the National Academy of Sciences of the United States of America, 121(43): e2410714121. doi:10.1073/pnas.2410714121.

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 Creators:
Zhang, H.1, Author
Li, Q.1, Author
Scheer, M. G.1, Author
Wang, R.1, Author
Tuo, C.1, Author
Zou, N.1, Author
Chen, W.1, Author
Li, J.1, Author
Cai, X.1, Author
Bao, C.1, Author
Li, M.-R.1, Author
Deng, K.1, Author
Watanabe, K.1, Author
Taniguchi, T.1, Author
Ye, M.1, Author
Tang, P.2, 3, Author           
Xu, Y.1, Author
Yu, P.1, Author
Avila, J.1, Author
Dudin, P.1, Author
Denlinger, J. D.1, AuthorYao, H.1, AuthorLian, B.1, AuthorDuan, W.1, AuthorZhou, S.1, Author more..
Affiliations:
1external, ou_persistent22              
2School of Materials Science and Engineering, Beihang University, ou_persistent22              
3Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              

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 Abstract: Flat bands and nontrivial topological physics are two important topics of condensed matter physics. With a unique stacking configuration analogous to the Su–Schrieffer–Heeger model, rhombohedral graphite (RG) is a potential candidate for realizing both flat bands and nontrivial topological physics. Here, we report experimental evidence of topological flat bands (TFBs) on the surface of bulk RG, which are topologically protected by bulk helical Dirac nodal lines via the bulk-boundary correspondence. Moreover, upon in situ electron doping, the surface TFBs show a splitting with exotic doping evolution, with an order-of-magnitude increase in the bandwidth of the lower split band, and pinning of the upper band near the Fermi level. These experimental observations together with Hartree–Fock calculations suggest that correlation effects are important in this system. Our results demonstrate RG as a platform for investigating the rich interplay between nontrivial band topology, correlation effects, and interaction-driven symmetry-broken states.

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Language(s): eng - English
 Dates: 2024-05-292024-09-102024-10-162024-10-22
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1073/pnas.2410714121
 Degree: -

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Project name : We acknowledge useful discussions with Haizhou Lu, Jing Wang, and Yves H. Kwan. This work is supported by the National Key R&D Program of China (Grant Number 2021YFA1400100), the National Natural Science Foundation of China (Grant Numbers 12234011, 12421004, 52388201, 52025024, 92250305, 12327805, and 11725418). H.Z. and C.B. acknowledge support from the Shuimu Tsinghua Scholar program, the Project funded by China Postdoctoral Science Foundation (Grant Numbers 2022M721887 and 2022M721886), and the National Natural Science Foundation of China (Grant Number 12304226). M.G.S. and B.L. acknowledge support from NSF through Princeton University’s Materials Research Science and Engineering Center DMR-2011750, and the NSF under award DMR-2141966. K.W. and T.T. acknowledge support from the Japan Society for the Promotion of Science KAKENHI Grant-in-Aid for Scientific Research (Grant Numbers 20H00354 and 23H02052) and World Premier International Research Center Initiative, Ministry of Education, Culture, Sports, Science and Technology, Japan. This research used resources of the Advanced Light Source, which is a Department of Energy Office of Science User Facility under contract Number DE-AC02-05CH11231. Part of this research also used the Beamline 03U of the Shanghai Synchrotron Radiation Facility, which is supported by SiP·ME2 project under Contract Number 11227902 from National Natural Science Foundation of China. We acknowledge SOLEIL for the provision of synchrotron radiation facilities of beamline ANTARES.
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Title: Proceedings of the National Academy of Sciences of the United States of America
  Other : PNAS
  Other : Proceedings of the National Academy of Sciences of the USA
  Abbreviation : Proc. Natl. Acad. Sci. U. S. A.
Source Genre: Journal
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Publ. Info: Washington, D.C. : National Academy of Sciences
Pages: - Volume / Issue: 121 (43) Sequence Number: e2410714121 Start / End Page: - Identifier: ISSN: 0027-8424
CoNE: https://pure.mpg.de/cone/journals/resource/954925427230