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Interplay of valley, layer and band topology towards interacting quantum phases in moiré bilayer graphene

Author

Listed:
  • Yungi Jeong

    (Institute for Basic Science
    Seoul National University)

  • Hangyeol Park

    (Institute for Basic Science
    Seoul National University)

  • Taeho Kim

    (Seoul National University)

  • Kenji Watanabe

    (1-1 Namiki)

  • Takashi Taniguchi

    (1-1 Namiki)

  • Jeil Jung

    (University of Seoul
    University of Seoul)

  • Joonho Jang

    (Institute for Basic Science
    Seoul National University)

Abstract

In Bernal-stacked bilayer graphene (BBG), the Landau levels give rise to an intimate connection between valley and layer degrees of freedom. Adding a moiré superlattice potential enriches the BBG physics with the formation of topological minibands — potentially leading to tunable exotic quantum transport. Here, we present magnetotransport measurements of a high-quality bilayer graphene–hexagonal boron nitride (hBN) heterostructure. The zero-degree alignment generates a strong moiré superlattice potential for the electrons in BBG and the resulting Landau fan diagram of longitudinal and Hall resistance displays a Hofstadter butterfly pattern with a high level of detail. We demonstrate that the intricate relationship between valley and layer degrees of freedom controls the topology of moiré-induced bands, significantly influencing the energetics of interacting quantum phases in the BBG superlattice. We further observe signatures of field-induced correlated insulators, helical edge states and clear quantizations of interaction-driven topological quantum phases, such as symmetry broken Chern insulators.

Suggested Citation

  • Yungi Jeong & Hangyeol Park & Taeho Kim & Kenji Watanabe & Takashi Taniguchi & Jeil Jung & Joonho Jang, 2024. "Interplay of valley, layer and band topology towards interacting quantum phases in moiré bilayer graphene," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-50475-x
    DOI: 10.1038/s41467-024-50475-x
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