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

Dohun Kim, Seyoung Jin, Takashi Taniguchi, Kenji Watanabe, Jurgen H. Smet, Gil Young Cho () and Youngwook Kim ()
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Dohun Kim: Daegu Gyeongbuk Institute of Science and Technology (DGIST)
Seyoung Jin: Pohang University of Science and Technology
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
Youngwook Kim: Daegu Gyeongbuk Institute of Science and Technology (DGIST)

Nature Communications, 2025, vol. 16, issue 1, 1-6

Abstract: 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.

Date: 2025
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DOI: 10.1038/s41467-024-55486-2

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