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Electronic Janus lattice and kagome-like bands in coloring-triangular MoTe2 monolayers

Author

Listed:
  • Le Lei

    (Renmin University of China
    Renmin University of China)

  • Jiaqi Dai

    (Renmin University of China
    Renmin University of China)

  • Haoyu Dong

    (Renmin University of China
    Renmin University of China)

  • Yanyan Geng

    (Renmin University of China
    Renmin University of China)

  • Feiyue Cao

    (Renmin University of China
    Renmin University of China)

  • Cong Wang

    (Renmin University of China
    Renmin University of China)

  • Rui Xu

    (Renmin University of China
    Renmin University of China)

  • Fei Pang

    (Renmin University of China
    Renmin University of China)

  • Zheng-Xin Liu

    (Renmin University of China
    Renmin University of China)

  • Fangsen Li

    (Chinese Academy of Sciences
    University of Science and Technology of China)

  • Zhihai Cheng

    (Renmin University of China
    Renmin University of China)

  • Guang Wang

    (National University of Defense Technology
    Tsinghua University)

  • Wei Ji

    (Renmin University of China
    Renmin University of China)

Abstract

Polymorphic structures of transition metal dichalcogenides (TMDs) host exotic electronic states, like charge density wave and superconductivity. However, the number of these structures is limited by crystal symmetries, which poses a challenge to achieving tailored lattices and properties both theoretically and experimentally. Here, we report a coloring-triangle (CT) latticed MoTe2 monolayer, termed CT-MoTe2, constructed by controllably introducing uniform and ordered mirror-twin-boundaries into a pristine monolayer via molecular beam epitaxy. Low-temperature scanning tunneling microscopy and spectroscopy (STM/STS) together with theoretical calculations reveal that the monolayer has an electronic Janus lattice, i.e., an energy-dependent atomic-lattice and a Te pseudo-sublattice, and shares the identical geometry with the Mo5Te8 layer. Dirac-like and flat electronic bands inherently existing in the CT lattice are identified by two broad and two prominent peaks in STS spectra, respectively, and verified with density-functional-theory calculations. Two types of intrinsic domain boundaries were observed, one of which maintains the electronic-Janus-lattice feature, implying potential applications as an energy-tunable electron-tunneling barrier in future functional devices.

Suggested Citation

  • Le Lei & Jiaqi Dai & Haoyu Dong & Yanyan Geng & Feiyue Cao & Cong Wang & Rui Xu & Fei Pang & Zheng-Xin Liu & Fangsen Li & Zhihai Cheng & Guang Wang & Wei Ji, 2023. "Electronic Janus lattice and kagome-like bands in coloring-triangular MoTe2 monolayers," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-42044-5
    DOI: 10.1038/s41467-023-42044-5
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    References listed on IDEAS

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    1. Shuoguo Yuan & Xin Luo & Hung Lit Chan & Chengcheng Xiao & Yawei Dai & Maohai Xie & Jianhua Hao, 2019. "Room-temperature ferroelectricity in MoTe2 down to the atomic monolayer limit," Nature Communications, Nature, vol. 10(1), pages 1-6, December.
    2. Karel-Alexander N. Duerloo & Yao Li & Evan J. Reed, 2014. "Structural phase transitions in two-dimensional Mo- and W-dichalcogenide monolayers," Nature Communications, Nature, vol. 5(1), pages 1-9, September.
    3. Y. D. Wang & W. L. Yao & Z. M. Xin & T. T. Han & Z. G. Wang & L. Chen & C. Cai & Yuan Li & Y. Zhang, 2020. "Band insulator to Mott insulator transition in 1T-TaS2," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
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    1. 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.

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