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

Dohun Kim ; Seyoung Jin ORCID ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials ScienceROR) ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials ScienceROR) ; Jurgen H. Smet ORCID ; Gil Young Cho ORCID ; Youngwook Kim ORCID

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Dohun Kim, Seyoung Jin, Takashi Taniguchi, Kenji Watanabe, Jurgen H. Smet, Gil Young Cho, Youngwook Kim. Observation of 1/3 fractional quantum Hall physics in balanced large angle twisted bilayer graphene. Nature Communications. 2025, 16 (1), 179. https://doi.org/10.1038/s41467-024-55486-2

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(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.

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Keyword: Magnetotransport, double layer systems, excitonic superfluid

Date published: 2025-01-02

Publisher: Springer Science and Business Media LLC

Journal:

  • Nature Communications (ISSN: 20411723) vol. 16 issue. 1 179

Funding:

  • National Research Foundation of Korea RS-2024-00444725
  • National Research Foundation of Korea 2020R1C1C1006914
  • National Research Foundation of Korea 2022M3H3A1098408
  • National Research Foundation of Korea 2022H1D3A3A01077468
  • National Research Foundation of Korea RS-2023-00208291
  • National Research Foundation of Korea 2023M3K5A1094810
  • National Research Foundation of Korea 2023M3K5A1094813
  • National Research Foundation of Korea RS-2024-00410027
  • Max-Planck-Gesellschaft Partner Group
  • MEXT | Japan Society for the Promotion of Science 21H05233
  • MEXT | Japan Society for the Promotion of Science 23H02052
  • MEXT | Japan Society for the Promotion of Science wpi
  • MEXT | Japan Society for the Promotion of Science 21H05233
  • MEXT | Japan Society for the Promotion of Science 23H02052
  • MEXT | Japan Society for the Promotion of Science wpi
  • Deutsche Forschungsgemeinschaft SPP 2244
  • United States Department of Defense | United States Air Force | AFMC | Air Force Office of Scientific Research FA2386-22-1- 4061
  • Samsung SSTFBA2002- 05
  • Samsung SSTF-BA2401-03
  • the Institute of Basic Science: IBS-R014-D1.

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1038/s41467-024-55486-2

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Updated at: 2025-02-05 12:30:25 +0900

Published on MDR: 2025-02-05 12:30:25 +0900

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