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Correlated states in alternating twisted bilayer-monolayer-monolayer graphene heterostructure |
| Ruirui Niu(牛锐锐)1, Xiangyan Han(韩香岩)1, Zhuangzhuang Qu(曲壮壮)1, Zhiyu Wang(王知雨)1, Zhuoxian Li(李卓贤)1, Qianling Liu(刘倩伶)1, Chunrui Han(韩春蕊)2,3,†, and Jianming Lu(路建明)1,‡ |
1 State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China;
2 Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China;
3 University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Highly controlled electronic correlation in twisted graphene heterostructures has gained enormous research interests recently, encouraging exploration in a wide range of moiré superlattices beyond the celebrated twisted bilayer graphene. Here we characterize correlated states in an alternating twisted Bernal bilayer-monolayer-monolayer graphene of ～ 1.74°, and find that both van Hove singularities and multiple correlated states are asymmetrically tuned by displacement fields. In particular, when one electron per moiré unit cell is occupied in the electron-side flat band, or the hole-side flat band (i.e., three holes per moiré unit cell), the correlated peaks are found to counterintuitively grow with heating and maximize around 20 K - a signature of Pomeranchuk effect. Our multilayer heterostructure opens more opportunities to engineer complicated systems for investigating correlated phenomena.
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Received: 22 September 2022
Revised: 07 October 2022
Accepted manuscript online: 27 October 2022
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PACS:
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72.80.Vp
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(Electronic transport in graphene)
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73.40.-c
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(Electronic transport in interface structures)
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73.21.Cd
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(Superlattices)
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| Fund: J.L. acknowledges support from the National Key R&D Program of China (Grant Nos. 2021YFA1400100 and 2019YFA0307800), the National Natural Science Foundation of China (Grant No. 11974027), and Beijing Natural Science Foundation (Grant No. Z190011). C.H. acknowledges support from the National Natural Science Foundation of China (Grant No. 62275265) and Beijing Natural Science Foundation (Grant No. 4222084). |
Corresponding Authors:
Chunrui Han, Jianming Lu
E-mail: hanchunrui@ime.ac.cn;jmlu@pku.edu.cn
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Cite this article:
Ruirui Niu(牛锐锐), Xiangyan Han(韩香岩), Zhuangzhuang Qu(曲壮壮), Zhiyu Wang(王知雨), Zhuoxian Li(李卓贤), Qianling Liu(刘倩伶), Chunrui Han(韩春蕊), and Jianming Lu(路建明) Correlated states in alternating twisted bilayer-monolayer-monolayer graphene heterostructure 2023 Chin. Phys. B 32 017202
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