TY - JOUR
T1 - Direct identification of Mott Hubbard band pattern beyond charge density wave superlattice in monolayer 1T-NbSe2
AU - Liu, Liwei
AU - Yang, Han
AU - Huang, Yuting
AU - Song, Xuan
AU - Zhang, Quanzhen
AU - Huang, Zeping
AU - Hou, Yanhui
AU - Chen, Yaoyao
AU - Xu, Ziqiang
AU - Zhang, Teng
AU - Wu, Xu
AU - Sun, Jiatao
AU - Huang, Yuan
AU - Zheng, Fawei
AU - Li, Xianbin
AU - Yao, Yugui
AU - Gao, Hong Jun
AU - Wang, Yeliang
N1 - Publisher Copyright:
© 2021, The Author(s).
PY - 2021/12/1
Y1 - 2021/12/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85103360459&partnerID=8YFLogxK
U2 - 10.1038/s41467-021-22233-w
DO - 10.1038/s41467-021-22233-w
M3 - Article
C2 - 33785747
AN - SCOPUS:85103360459
SN - 2041-1723
VL - 12
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 1978
ER -