Isospin competitions and valley polarized correlated insulators in twisted double bilayer graphene

Le Liu, Shihao Zhang, Yanbang Chu, Cheng Shen, Yuan Huang, Yalong Yuan, Jinpeng Tian, Jian Tang, Yiru Ji, Rong Yang, Kenji Watanabe, Takashi Taniguchi, Dongxia Shi, Jianpeng Liu, Wei Yang () and Guangyu Zhang ()
Additional contact information
Le Liu: Chinese Academy of Sciences
Shihao Zhang: ShanghaiTech University
Yanbang Chu: Chinese Academy of Sciences
Cheng Shen: Chinese Academy of Sciences
Yuan Huang: Beijing Institute of Technology
Yalong Yuan: Chinese Academy of Sciences
Jinpeng Tian: Chinese Academy of Sciences
Jian Tang: Chinese Academy of Sciences
Yiru Ji: Chinese Academy of Sciences
Rong Yang: Chinese Academy of Sciences
Kenji Watanabe: Research Center for Functional Materials, National Institute for Materials Science
Takashi Taniguchi: International Center for Materials Nanoarchitectonics, National Institute for Materials Science
Dongxia Shi: Chinese Academy of Sciences
Jianpeng Liu: ShanghaiTech University
Wei Yang: Chinese Academy of Sciences
Guangyu Zhang: Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract New phase of matter usually emerges when a given symmetry breaks spontaneously, which can involve charge, spin, and valley degree of freedoms. Here, we report an observation of new correlated insulators evolved from spin-polarized states to valley-polarized states in twisted double bilayer graphene (TDBG) driven by the displacement field (D). At a high field |D | > 0.7 V/nm, we observe valley polarized correlated insulators with a big Zeeman g factor of ~10, both at v = 2 in the moiré conduction band and more surprisingly at v = −2 in the moiré valence band. Moreover, we observe a valley polarized Chern insulator with C = 2 emanating at v = 2 in the electron side and a valley polarized Fermi surface around v = −2 in the hole side. Our results demonstrate a feasible way to realize isospin control and to obtain new phases of matter in TDBG by the displacement field, and might benefit other twisted or non-twisted multilayer systems.

Date: 2022
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DOI: 10.1038/s41467-022-30998-x

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