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Li, Si-yu; Wang, Zhengwen; Xue, Yucheng; Wang, Yingbo; Zhang, Shihao; Liu, Jianpeng; Zhu, Zheng; Watanabe, Kenji; Taniguchi, Takashi; Gao, Hong-jun; Jiang, Yuhang; Mao, Jinhai
Nature communications, 07/2022, Letnik: 13, Številka: 1Journal Article
Abstract Flat bands in Van der Waals heterostructure provide an ideal platform for unveiling emergent quantum electronic phases. One celebrated example is twisted monolayer-bilayer graphene, in which the effects of electronic correlation have been observed. Here, we report the observation via scanning tunnelling microscopy and spectroscopy of correlated insulating states in twisted monolayer-bilayer graphene, leading to the formation of an electron crystal phase. At integer fillings, the strong Coulomb interaction redistributes flat-band electrons within one moiré unit cell, producing an insulating state with vanishing density of states at the Fermi level. Moreover, our approach enables the direct visualization of an ordered lattice of topological torus-shaped states, generated by the interaction between the electron crystal and the non-trivial band topology of twisted monolayer-bilayer graphene. Our results illustrate an efficient strategy for entwining topological physics with strong electron correlation in twisted van der Waals structures.
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