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Identifying topological corner states in two-dimensional metal-organic frameworks

Author

Listed:
  • Tianyi Hu

    (University of Science and Technology of China)

  • Weiliang Zhong

    (Institute of Physics, Chinese Academy of Sciences)

  • Tingfeng Zhang

    (University of Science and Technology of China)

  • Weihua Wang

    (Institute of Physics, Chinese Academy of Sciences)

  • Z. F. Wang

    (University of Science and Technology of China
    University of Science and Technology of China)

Abstract

Due to the diversity of molecular building blocks, the two-dimensional (2D) metal-organic frameworks (MOFs) are ideal platforms to realize exotic lattice models in condensed matter theory. In this work, we demonstrate the universal existence of topological corner states in 2D MOFs with a star lattice configuration, and confirm the intriguing higher-order nontrivial topology in the energy window between two Kagome-bands, or between Dirac-band and four-band. Furthermore, combining first-principles calculations and scanning tunneling microscopy measurements, the unique topological corner state is directly identified in monolayer Ni3(HITP)2 (HITP = 2,3,6,7,10,11-hexaiminotriphenylene) grown on the Au(111) substrate. Our results not only illustrate the first organic topological state in the experiments, but also offer an exciting opportunity to study higher-order topology in 2D MOFs with the large insulating band gap.

Suggested Citation

  • Tianyi Hu & Weiliang Zhong & Tingfeng Zhang & Weihua Wang & Z. F. Wang, 2023. "Identifying topological corner states in two-dimensional metal-organic frameworks," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-42884-1
    DOI: 10.1038/s41467-023-42884-1
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    References listed on IDEAS

    as
    1. Z.F Wang & Zheng Liu & Feng Liu, 2013. "Organic topological insulators in organometallic lattices," Nature Communications, Nature, vol. 4(1), pages 1-5, June.
    2. Marc Serra-Garcia & Valerio Peri & Roman Süsstrunk & Osama R. Bilal & Tom Larsen & Luis Guillermo Villanueva & Sebastian D. Huber, 2018. "Observation of a phononic quadrupole topological insulator," Nature, Nature, vol. 555(7696), pages 342-345, March.
    3. Daniel J. Rizzo & Gregory Veber & Ting Cao & Christopher Bronner & Ting Chen & Fangzhou Zhao & Henry Rodriguez & Steven G. Louie & Michael F. Crommie & Felix R. Fischer, 2018. "Topological band engineering of graphene nanoribbons," Nature, Nature, vol. 560(7717), pages 204-208, August.
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