Strongly coupled magneto-exciton condensates in large-angle twisted double bilayer graphene

Qingxin Li, Yiwei Chen, LingNan Wei, Hong Chen, Yan Huang, Yujian Zhu, Wang Zhu, Dongdong An, Junwei Song, Qikang Gan, Qi Zhang, Kenji Watanabe, Takashi Taniguchi, Xiaoyang Shi (), Kostya S. Novoselov, Rui Wang (), Geliang Yu () and Lei Wang ()
Additional contact information
Qingxin Li: Nanjing University
Yiwei Chen: Nanjing University
LingNan Wei: Nanjing University
Hong Chen: Nanjing University
Yan Huang: Nanjing University
Yujian Zhu: Nanjing University
Wang Zhu: Nanjing University
Dongdong An: Nanjing University
Junwei Song: Nanjing University
Qikang Gan: Nanjing University
Qi Zhang: Nanjing University
Kenji Watanabe: National Institute for Materials Science
Takashi Taniguchi: National Institute for Materials Science
Xiaoyang Shi: University at Albany
Kostya S. Novoselov: National University of Singapore
Rui Wang: Nanjing University
Geliang Yu: Nanjing University
Lei Wang: Nanjing University

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Excitons, pairs of electrons and holes, undergo a Bose-Einstein condensation at low temperatures. An important platform to study excitons is double-layer two-dimensional electron gases, with two parallel planes of electrons and holes separated by a thin insulating layer. Lowering this separation (d) strengthens the exciton binding energy, however, leads to the undesired interlayer tunneling, resulting in annihilation of excitons. Here, we report the observation of a sequences of robust exciton condensates (ECs) in double bilayer graphene twisted to ~ 10° with no insulating mid-layer. The large momentum mismatch between two graphene layers suppresses interlayer tunneling, reaching a d ~ 0.334 nm. Measuring the bulk and edge transport, we find incompressible states corresponding to ECs when both layers are in half-filled N = 0, 1 Landau levels (LLs). Theoretical calculations suggest that the low-energy charged excitation of ECs can be meron-antimeron or particle-hole pair, which relies on both LL index and carrier type. Our results establish a novel platform with extreme coupling strength for studying quantum bosonic phase.

Date: 2024
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DOI: 10.1038/s41467-024-49406-7

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