Observation of dichotomic field-tunable electronic structure in twisted monolayer-bilayer graphene

Hongyun Zhang, Qian Li, Youngju Park, Yujin Jia, Wanying Chen, Jiaheng Li, Qinxin Liu, Changhua Bao, Nicolas Leconte, Shaohua Zhou, Yuan Wang, Kenji Watanabe, Takashi Taniguchi, Jose Avila, Pavel Dudin, Pu Yu, Hongming Weng, Wenhui Duan, Quansheng Wu, Jeil Jung and Shuyun Zhou ()
Additional contact information
Hongyun Zhang: Tsinghua University
Qian Li: Tsinghua University
Youngju Park: University of Seoul
Yujin Jia: Chinese Academy of Sciences
Wanying Chen: Tsinghua University
Jiaheng Li: Chinese Academy of Sciences
Qinxin Liu: Tsinghua University
Changhua Bao: Tsinghua University
Nicolas Leconte: University of Seoul
Shaohua Zhou: Tsinghua University
Yuan Wang: Tsinghua University
Kenji Watanabe: National Institute for Materials Science
Takashi Taniguchi: National Institute for Materials Science
Jose Avila: L’Orme des Merisiers
Pavel Dudin: L’Orme des Merisiers
Pu Yu: Tsinghua University
Hongming Weng: Chinese Academy of Sciences
Wenhui Duan: Tsinghua University
Quansheng Wu: Chinese Academy of Sciences
Jeil Jung: University of Seoul
Shuyun Zhou: Tsinghua University

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract Twisted bilayer graphene (tBLG) provides a fascinating platform for engineering flat bands and inducing correlated phenomena. By designing the stacking architecture of graphene layers, twisted multilayer graphene can exhibit different symmetries with rich tunability. For example, in twisted monolayer-bilayer graphene (tMBG) which breaks the C2z symmetry, transport measurements reveal an asymmetric phase diagram under an out-of-plane electric field, exhibiting correlated insulating state and ferromagnetic state respectively when reversing the field direction. Revealing how the electronic structure evolves with electric field is critical for providing a better understanding of such asymmetric field-tunable properties. Here we report the experimental observation of field-tunable dichotomic electronic structure of tMBG by nanospot angle-resolved photoemission spectroscopy (NanoARPES) with operando gating. Interestingly, selective enhancement of the relative spectral weight contributions from monolayer and bilayer graphene is observed when switching the polarity of the bias voltage. Combining experimental results with theoretical calculations, the origin of such field-tunable electronic structure, resembling either tBLG or twisted double-bilayer graphene (tDBG), is attributed to the selectively enhanced contribution from different stacking graphene layers with a strong electron-hole asymmetry. Our work provides electronic structure insights for understanding the rich field-tunable physics of tMBG.

Date: 2024
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DOI: 10.1038/s41467-024-48166-8

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