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Tunable correlated states and spin-polarized phases in twisted bilayer–bilayer graphene

Author

Listed:
  • Yuan Cao

    (Massachusetts Institute of Technology)

  • Daniel Rodan-Legrain

    (Massachusetts Institute of Technology)

  • Oriol Rubies-Bigorda

    (Massachusetts Institute of Technology)

  • Jeong Min Park

    (Massachusetts Institute of Technology)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Pablo Jarillo-Herrero

    (Massachusetts Institute of Technology)

Abstract

The recent discovery of correlated insulator states and superconductivity in magic-angle twisted bilayer graphene1,2 has enabled the experimental investigation of electronic correlations in tunable flat-band systems realized in twisted van der Waals heterostructures3–6. This novel twist angle degree of freedom and control should be generalizable to other two-dimensional systems, which may exhibit similar correlated physics behaviour, and could enable techniques to tune and control the strength of electron–electron interactions. Here we report a highly tunable correlated system based on small-angle twisted bilayer–bilayer graphene (TBBG), consisting of two rotated sheets of Bernal-stacked bilayer graphene. We find that TBBG exhibits a rich phase diagram, with tunable correlated insulator states that are highly sensitive to both the twist angle and the application of an electric displacement field, the latter reflecting the inherent polarizability of Bernal-stacked bilayer graphene7,8. The correlated insulator states can be switched on and off by the displacement field at all integer electron fillings of the moiré unit cell. The response of these correlated states to magnetic fields suggests evidence of spin-polarized ground states, in stark contrast to magic-angle twisted bilayer graphene. Furthermore, in the regime of lower twist angles, TBBG shows multiple sets of flat bands near charge neutrality, resulting in numerous correlated states corresponding to half-filling of each of these flat bands, all of which are tunable by the displacement field as well. Our results could enable the exploration of twist-angle- and electric-field-controlled correlated phases of matter in multi-flat-band twisted superlattices.

Suggested Citation

  • Yuan Cao & Daniel Rodan-Legrain & Oriol Rubies-Bigorda & Jeong Min Park & Kenji Watanabe & Takashi Taniguchi & Pablo Jarillo-Herrero, 2020. "Tunable correlated states and spin-polarized phases in twisted bilayer–bilayer graphene," Nature, Nature, vol. 583(7815), pages 215-220, July.
  • Handle: RePEc:nat:nature:v:583:y:2020:i:7815:d:10.1038_s41586-020-2260-6
    DOI: 10.1038/s41586-020-2260-6
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    Citations

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    Cited by:

    1. Manabendra Kuiri & Christopher Coleman & Zhenxiang Gao & Aswin Vishnuradhan & Kenji Watanabe & Takashi Taniguchi & Jihang Zhu & Allan H. MacDonald & Joshua Folk, 2022. "Spontaneous time-reversal symmetry breaking in twisted double bilayer graphene," Nature Communications, Nature, vol. 13(1), pages 1-6, December.
    2. 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 Avil, 2024. "Observation of dichotomic field-tunable electronic structure in twisted monolayer-bilayer graphene," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    3. Yufei Sun & Yujia Wang & Enze Wang & Bolun Wang & Hengyi Zhao & Yongpan Zeng & Qinghua Zhang & Yonghuang Wu & Lin Gu & Xiaoyan Li & Kai Liu, 2022. "Determining the interlayer shearing in twisted bilayer MoS2 by nanoindentation," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    4. Pratap Chandra Adak & Subhajit Sinha & Debasmita Giri & Dibya Kanti Mukherjee & Chandan & L. D. Varma Sangani & Surat Layek & Ayshi Mukherjee & Kenji Watanabe & Takashi Taniguchi & H. A. Fertig & Arij, 2022. "Perpendicular electric field drives Chern transitions and layer polarization changes in Hofstadter bands," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    5. Martin Claassen & Lede Xian & Dante M. Kennes & Angel Rubio, 2022. "Ultra-strong spin–orbit coupling and topological moiré engineering in twisted ZrS2 bilayers," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    6. Yifan Xie & Shuo Feng & Linxiao Deng & Aoran Cai & Liyu Gan & Zifan Jiang & Peng Yang & Guilin Ye & Zaiqing Liu & Li Wen & Qing Zhu & Wanjun Zhang & Zhanpeng Zhang & Jiahe Li & Zeyu Feng & Chutian Zha, 2023. "Inverse design of chiral functional films by a robotic AI-guided system," Nature Communications, Nature, vol. 14(1), pages 1-13, December.
    7. Trithep Devakul & Valentin Crépel & Yang Zhang & Liang Fu, 2021. "Magic in twisted transition metal dichalcogenide bilayers," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    8. 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 Yan, 2022. "Isospin competitions and valley polarized correlated insulators in twisted double bilayer graphene," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    9. Dorri Halbertal & Simon Turkel & Christopher J. Ciccarino & Jonas B. Profe & Nathan Finney & Valerie Hsieh & Kenji Watanabe & Takashi Taniguchi & James Hone & Cory Dean & Prineha Narang & Abhay N. Pas, 2022. "Unconventional non-local relaxation dynamics in a twisted trilayer graphene moiré superlattice," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    10. Hanyu Wang & Wei Xu & Zeyong Wei & Yiyuan Wang & Zhanshan Wang & Xinbin Cheng & Qinghua Guo & Jinhui Shi & Zhihong Zhu & Biao Yang, 2024. "Twisted photonic Weyl meta-crystals and aperiodic Fermi arc scattering," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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