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Direct identification of Mott Hubbard band pattern beyond charge density wave superlattice in monolayer 1T-NbSe2

Author

Listed:
  • Liwei Liu

    (Beijing Institute of Technology)

  • Han Yang

    (Beijing Institute of Technology)

  • Yuting Huang

    (Jilin University)

  • Xuan Song

    (Beijing Institute of Technology)

  • Quanzhen Zhang

    (Beijing Institute of Technology)

  • Zeping Huang

    (Beijing Institute of Technology)

  • Yanhui Hou

    (Beijing Institute of Technology)

  • Yaoyao Chen

    (Beijing Institute of Technology)

  • Ziqiang Xu

    (Beijing Institute of Technology)

  • Teng Zhang

    (Beijing Institute of Technology)

  • Xu Wu

    (Beijing Institute of Technology)

  • Jiatao Sun

    (Beijing Institute of Technology)

  • Yuan Huang

    (Beijing Institute of Technology
    Chinese Academy of Sciences)

  • Fawei Zheng

    (Beijing Institute of Technology)

  • Xianbin Li

    (Jilin University)

  • Yugui Yao

    (Beijing Institute of Technology)

  • Hong-Jun Gao

    (Chinese Academy of Sciences)

  • Yeliang Wang

    (Beijing Institute of Technology)

Abstract

Understanding Mott insulators and charge density waves (CDW) is critical for both fundamental physics and future device applications. However, the relationship between these two phenomena remains unclear, particularly in systems close to two-dimensional (2D) limit. In this study, we utilize scanning tunneling microscopy/spectroscopy to investigate monolayer 1T-NbSe2 to elucidate the energy of the Mott upper Hubbard band (UHB), and reveal that the spin-polarized UHB is spatially distributed away from the dz2 orbital at the center of the CDW unit. Moreover, the UHB shows a √3 × √3 R30° periodicity in addition to the typically observed CDW pattern. Furthermore, a pattern similar to the CDW order is visible deep in the Mott gap, exhibiting CDW without contribution of the Mott Hubbard band. Based on these findings in monolayer 1T-NbSe2, we provide novel insights into the relation between the correlated and collective electronic structures in monolayer 2D systems.

Suggested Citation

  • Liwei Liu & Han Yang & Yuting Huang & Xuan Song & Quanzhen Zhang & Zeping Huang & Yanhui Hou & Yaoyao Chen & Ziqiang Xu & Teng Zhang & Xu Wu & Jiatao Sun & Yuan Huang & Fawei Zheng & Xianbin Li & Yugu, 2021. "Direct identification of Mott Hubbard band pattern beyond charge density wave superlattice in monolayer 1T-NbSe2," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-22233-w
    DOI: 10.1038/s41467-021-22233-w
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