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Observation of kagome-like bands in two-dimensional semiconducting Cr8Se12

Author

Listed:
  • Sisheng Duan

    (National University of Singapore
    National University of Singapore)

  • Jing-Yang You

    (National University of Singapore)

  • Zhihao Cai

    (University of Chinese Academy of Sciences)

  • Jian Gou

    (Zhejiang University)

  • Dong Li

    (University of Chinese Academy of Sciences)

  • Yu Li Huang

    (International Campus of Tianjin University)

  • Xiaojiang Yu

    (5 Research Link)

  • Siew Lang Teo

    (Technology and Research))

  • Shuo Sun

    (National University of Singapore
    Shanghai University)

  • Yihe Wang

    (National University of Singapore
    International Campus of Tianjin University)

  • Ming Lin

    (Technology and Research))

  • Chun Zhang

    (National University of Singapore)

  • Baojie Feng

    (University of Chinese Academy of Sciences)

  • Andrew T. S. Wee

    (National University of Singapore)

  • Wei Chen

    (National University of Singapore
    National University of Singapore
    International Campus of Tianjin University
    National University of Singapore (Suzhou) Research Institute)

Abstract

The kagome lattice is a versatile platform for investigating correlated electronic states. However, its realization in two-dimensional (2D) semiconductors for tunable device applications is still challenging. An alternative strategy to create kagome-like bands is to realize a coloring-triangle (CT) lattice in semiconductors through a distortion of a modified triangular lattice. Here, we report the observation of low-energy kagome-like bands in a semiconducting 2D transition metal chalcogenide—Cr8Se12 with a thickness of 7 atomic layers—which exhibits a CT lattice and a bandgap of 0.8 eV. The Cr-deficient layer beneath the topmost Se-full layer is partially occupied with 2/3 occupancy, yielding a √3 × √3 Cr honeycomb network. Angle-resolved photoemission spectroscopy measurements and first-principles investigations reveal the surface kagome-like bands near the valence band maximum, which are attributed to topmost Se pz orbitals modulated by the honeycomb Cr.

Suggested Citation

  • Sisheng Duan & Jing-Yang You & Zhihao Cai & Jian Gou & Dong Li & Yu Li Huang & Xiaojiang Yu & Siew Lang Teo & Shuo Sun & Yihe Wang & Ming Lin & Chun Zhang & Baojie Feng & Andrew T. S. Wee & Wei Chen, 2024. "Observation of kagome-like bands in two-dimensional semiconducting Cr8Se12," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-53314-1
    DOI: 10.1038/s41467-024-53314-1
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    References listed on IDEAS

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