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Emergence of correlations in twisted monolayer-trilayer graphene heterostructures |
| Zhang Zhou(周璋)1,†, Kenji Watanabe2, Takashi Taniguchi2, Xiao Lin(林晓)1, Jinhai Mao(毛金海)1,‡, and Hong-Jun Gao(高鸿钧)3 |
1 School of Physical Sciences and CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100049, China;
2 Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, 305-0044, Japan;
3 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China |
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Abstract Twisted bilayer graphene heterostructures have recently emerged as a well-established platform for studying strongly correlated phases, such as correlated insulating, superconducting, and topological states. Extending this notion to twisted multilayer graphene heterostructures has exhibited more diverse correlated phases, as some fundamental properties related to symmetry and band structures are correspondingly modified. Here, we report the observations of correlated states in twisted monolayer-trilayer (Bernal stacked) graphene heterostructures. Correlated phases at integer fillings of the moiré unit cell are revealed at a high displacement field and stabilized with a moderate magnetic field on the electron-doping side at a twist angle of 1.45°, where the lift of degeneracy at the integer fillings is observed in the Landau fan diagram. Our results demonstrate the effectiveness of moiré engineering in an extended structure and provide insights into electric-field tunable correlated phases.
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Received: 20 April 2023
Revised: 21 June 2023
Accepted manuscript online: 03 July 2023
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PACS:
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72.80.Vp
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(Electronic transport in graphene)
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71.27.+a
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(Strongly correlated electron systems; heavy fermions)
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74.78.Fk
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(Multilayers, superlattices, heterostructures)
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| Fund: We acknowledge support from the National Key R&D Program of China (Grant No. 2019YFA0307800, J.M.), Beijing Natural Science Foundation (Grant No. Z190011, J.M.), the National Natural Science Foundation of China (Grant Nos. 11974347, J.M. and 12204479, Z.Z.), and Fundamental Research Funds for the Central Universities (J.M.). |
Corresponding Authors:
Zhang Zhou, Jinhai Ma
E-mail: zhouzhang1992@qq.com;jhmao@ucas.edu.cn
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Cite this article:
Zhang Zhou(周璋), Kenji Watanabe, Takashi Taniguchi, Xiao Lin(林晓), Jinhai Mao(毛金海), and Hong-Jun Gao(高鸿钧) Emergence of correlations in twisted monolayer-trilayer graphene heterostructures 2023 Chin. Phys. B 32 097203
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