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Observation of 1/3 fractional quantum Hall physics in balanced large angle twisted bilayer graphene

Author

Listed:
  • Dohun Kim

    (Daegu Gyeongbuk Institute of Science and Technology (DGIST))

  • Seyoung Jin

    (Pohang University of Science and Technology
    Institute for Basic Science)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Jurgen H. Smet

    (Max Planck Institute for Solid State Research)

  • Gil Young Cho

    (Institute for Basic Science
    Korea Advanced Institute of Science and Technology
    Asia-Pacific Center for Theoretical Physics)

  • Youngwook Kim

    (Daegu Gyeongbuk Institute of Science and Technology (DGIST))

Abstract

Magnetotransport of conventional semiconductor based double layer systems with barrier suppressed interlayer tunneling has been a rewarding subject due to the emergence of an interlayer coherent state that behaves as an excitonic superfluid. Large angle twisted bilayer graphene offers unprecedented strong interlayer Coulomb interaction, since both layer thickness and layer spacing are of atomic scale and a barrier is no more needed as the twist induced momentum mismatch suppresses tunneling. The extra valley degree of freedom also adds richness. Here we report the observation of fractional quantum Hall physics at 1/3 total filling for balanced layer population in this system. Monte Carlo simulations support that the ground state is also an excitonic superfluid but the excitons are composed of fractional rather than elementary charges. The observed phase transitions with an applied displacement field at this and other fractional fillings are also addressed with simulations. They reveal ground states with different topology and symmetry properties.

Suggested Citation

  • Dohun Kim & Seyoung Jin & Takashi Taniguchi & Kenji Watanabe & Jurgen H. Smet & Gil Young Cho & Youngwook Kim, 2025. "Observation of 1/3 fractional quantum Hall physics in balanced large angle twisted bilayer graphene," Nature Communications, Nature, vol. 16(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-024-55486-2
    DOI: 10.1038/s41467-024-55486-2
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    References listed on IDEAS

    as
    1. Xiaobo Lu & Petr Stepanov & Wei Yang & Ming Xie & Mohammed Ali Aamir & Ipsita Das & Carles Urgell & Kenji Watanabe & Takashi Taniguchi & Guangyu Zhang & Adrian Bachtold & Allan H. MacDonald & Dmitri K, 2019. "Superconductors, orbital magnets and correlated states in magic-angle bilayer graphene," Nature, Nature, vol. 574(7780), pages 653-657, October.
    2. Yuan Cao & Valla Fatemi & Ahmet Demir & Shiang Fang & Spencer L. Tomarken & Jason Y. Luo & Javier D. Sanchez-Yamagishi & Kenji Watanabe & Takashi Taniguchi & Efthimios Kaxiras & Ray C. Ashoori & Pablo, 2018. "Correlated insulator behaviour at half-filling in magic-angle graphene superlattices," Nature, Nature, vol. 556(7699), pages 80-84, April.
    3. B. M. Hunt & J. I. A. Li & A. A. Zibrov & L. Wang & T. Taniguchi & K. Watanabe & J. Hone & C. R. Dean & M. Zaletel & R. C. Ashoori & A. F. Young, 2017. "Direct measurement of discrete valley and orbital quantum numbers in bilayer graphene," Nature Communications, Nature, vol. 8(1), pages 1-7, December.
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