Unconventional correlated insulator in CrOCl-interfaced Bernal bilayer graphene

Kaining Yang, Xiang Gao, Yaning Wang, Tongyao Zhang, Yuchen Gao, Xin Lu (), Shihao Zhang, Jianpeng Liu, Pingfan Gu, Zhaoping Luo, Runjie Zheng, Shimin Cao, Hanwen Wang, Xingdan Sun, Kenji Watanabe, Takashi Taniguchi, Xiuyan Li, Jing Zhang, Xi Dai (), Jian-Hao Chen (), Yu Ye () and Zheng Han ()
Additional contact information
Kaining Yang: Shanxi University
Xiang Gao: Shanxi University
Yaning Wang: Institute of Metal Research, Chinese Academy of Sciences
Tongyao Zhang: Shanxi University
Yuchen Gao: Collaborative Innovation Center of Quantum Matter
Xin Lu: ShanghaiTech University
Shihao Zhang: ShanghaiTech University
Jianpeng Liu: ShanghaiTech University
Pingfan Gu: Collaborative Innovation Center of Quantum Matter
Zhaoping Luo: Institute of Metal Research, Chinese Academy of Sciences
Runjie Zheng: Peking University
Shimin Cao: Peking University
Hanwen Wang: Institute of Metal Research, Chinese Academy of Sciences
Xingdan Sun: Institute of Metal Research, Chinese Academy of Sciences
Kenji Watanabe: National Institute for Materials Science
Takashi Taniguchi: National Institute for Materials Science
Xiuyan Li: Institute of Metal Research, Chinese Academy of Sciences
Jing Zhang: Shanxi University
Xi Dai: University of California
Jian-Hao Chen: Peking University
Yu Ye: Collaborative Innovation Center of Quantum Matter
Zheng Han: Shanxi University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract The realization of graphene gapped states with large on/off ratios over wide doping ranges remains challenging. Here, we investigate heterostructures based on Bernal-stacked bilayer graphene (BLG) atop few-layered CrOCl, exhibiting an over-1-GΩ-resistance insulating state in a widely accessible gate voltage range. The insulating state could be switched into a metallic state with an on/off ratio up to 107 by applying an in-plane electric field, heating, or gating. We tentatively associate the observed behavior to the formation of a surface state in CrOCl under vertical electric fields, promoting electron–electron (e–e) interactions in BLG via long-range Coulomb coupling. Consequently, at the charge neutrality point, a crossover from single particle insulating behavior to an unconventional correlated insulator is enabled, below an onset temperature. We demonstrate the application of the insulating state for the realization of a logic inverter operating at low temperatures. Our findings pave the way for future engineering of quantum electronic states based on interfacial charge coupling.

Date: 2023
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DOI: 10.1038/s41467-023-37769-2

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