Correlated states in doubly-aligned hBN/graphene/hBN heterostructures

Xingdan Sun, Shihao Zhang, Zhiyong Liu, Honglei Zhu, Jinqiang Huang, Kai Yuan, Zhenhua Wang (), Kenji Watanabe, Takashi Taniguchi, Xiaoxi Li, Mengjian Zhu, Jinhai Mao, Teng Yang, Jun Kang (), Jianpeng Liu (), Yu Ye (), Zheng Vitto Han () and Zhidong Zhang
Additional contact information
Xingdan Sun: Institute of Metal Research, Chinese Academy of Sciences
Shihao Zhang: ShanghaiTech University
Zhiyong Liu: Institute of Metal Research, Chinese Academy of Sciences
Honglei Zhu: Institute of Metal Research, Chinese Academy of Sciences
Jinqiang Huang: Institute of Metal Research, Chinese Academy of Sciences
Kai Yuan: Peking University
Zhenhua Wang: Institute of Metal Research, Chinese Academy of Sciences
Kenji Watanabe: National Institute for Materials Science
Takashi Taniguchi: National Institute for Materials Science
Xiaoxi Li: Institute of Metal Research, Chinese Academy of Sciences
Mengjian Zhu: National University of Defense Technology
Jinhai Mao: University of Chinese Academy of Sciences
Teng Yang: Institute of Metal Research, Chinese Academy of Sciences
Jun Kang: Beijing Computational Science Research Center
Jianpeng Liu: ShanghaiTech University
Yu Ye: Peking University
Zheng Vitto Han: Shanxi University
Zhidong Zhang: Institute of Metal Research, Chinese Academy of Sciences

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Interfacial moiré superlattices in van der Waals vertical assemblies effectively reconstruct the crystal symmetry, leading to opportunities for investigating exotic quantum states. Notably, a two-dimensional nanosheet has top and bottom open surfaces, allowing the specific case of doubly aligned super-moiré lattice to serve as a toy model for studying the tunable lattice symmetry and the complexity of related electronic structures. Here, we show that by doubly aligning a graphene monolayer to both top and bottom encapsulating hexagonal boron nitride (h-BN), multiple conductivity minima are observed away from the main Dirac point, which are sensitively tunable with respect to the small twist angles. Moreover, our experimental evidences together with theoretical calculations suggest correlated insulating states at integer fillings of −5, −6, −7 electrons per moiré unit cell, possibly due to inter-valley coherence. Our results provide a way to construct intriguing correlations in 2D electronic systems in the weak interaction regime.

Date: 2021
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DOI: 10.1038/s41467-021-27514-y

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