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

• DOI: 10.1038/s41467-021-22233-w
• Publication Date: 2021-03-30T10:03:17Z
• Authors: 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; Yugui Yao; Hong-Jun Gao; Yeliang Wang
• Keywords: Mott insulator; Charge Density Wave

Abstract Understanding Mott insulators and charge density waves (CDW) is critical for both fundamental physics 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 investigate monolayer 1T-NbSe 2 elucidate energy of upper Hubbard band (UHB), reveal that spin-polarized UHB spatially distributed away from dz orbital at center CDW unit. Moreover, shows a √3 × R30° periodicity addition typically observed pattern. Furthermore, pattern similar order visible deep gap, exhibiting without contribution band. Based on findings , provide novel insights into relation correlated collective electronic structures 2D systems.