Observation of dichotomic field-tunable electronic structure in twisted monolayer-bilayer graphene
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2024
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| author | Zhang, Hongyun Li, Qian Park, Youngju Jia, Yujin Chen, Wanying Li, Jiaheng Liu, Qinxin Bao, Changhua Leconte, Nicolas Zhou, Shaohua Wang, Yuan Watanabe, Kenji Taniguchi, Takashi Avila, Jose Dudin, Pavel Yu, Pu Weng, Hongming Duan, Wenhui Wu, Quansheng Jung, Jeil Zhou, Shuyun |
| author_facet | Zhang, Hongyun Li, Qian Park, Youngju Jia, Yujin Chen, Wanying Li, Jiaheng Liu, Qinxin Bao, Changhua Leconte, Nicolas Zhou, Shaohua Wang, Yuan Watanabe, Kenji Taniguchi, Takashi Avila, Jose Dudin, Pavel Yu, Pu Weng, Hongming Duan, Wenhui Wu, Quansheng Jung, Jeil Zhou, Shuyun |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2404_05533 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Observation of dichotomic field-tunable electronic structure in twisted monolayer-bilayer graphene Zhang, Hongyun Li, Qian Park, Youngju Jia, Yujin Chen, Wanying Li, Jiaheng Liu, Qinxin Bao, Changhua Leconte, Nicolas Zhou, Shaohua Wang, Yuan Watanabe, Kenji Taniguchi, Takashi Avila, Jose Dudin, Pavel Yu, Pu Weng, Hongming Duan, Wenhui Wu, Quansheng Jung, Jeil Zhou, Shuyun Mesoscale and Nanoscale Physics 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. |
| title | Observation of dichotomic field-tunable electronic structure in twisted monolayer-bilayer graphene |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2404.05533 |