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Flat Band and Many-body Gap in Chirally Twisted Triple Bilayer Graphene

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arxiv 2501.06852 v1 pith:7KVVANJV submitted 2025-01-12 cond-mat.mes-hall

Wenlu Lin , Wenxuan Wang , Shimin Cao , Miao Liang , Lili Zhao , Kenji Watanabe , Takashi Taniguchi , Jinhua Gao
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Jianhao Chen Xiaobo Lu Yang Liu
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classification cond-mat.mes-hall
keywords bandsflatbilayergraphenebandchirallyexperimentallymoir
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We experimentally investigate the band structures of chirally twisted triple bilayer graphene. The new kind of moir\'e structure, formed by three pieces of helically stacked Bernal bilayer graphene, has flat bands at charge neutral point based on the continuum approximation. We experimentally confirm the existence of flat bands and directly acquire the gap in-between flat bands as well as between the flat bands and dispersive bands from the capacitance measurements. We discover a finite gap even at zero perpendicular electric field, possibly induced by the Coulomb interaction and ferromagnetism. Our quantitative study not only provides solid evidence for the flat-band and interesting physics, but also introduces a quantitative approach to explore phenomena of similar moir\'e systems.

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Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Sliding-tuned Quantum Geometry in Moir\'e Systems: Nonlinear Hall Effect and Quantum Metric Control

    cond-mat.mes-hall 2025-09 conditional novelty 6.0 of 10

    Interlayer sliding in multi-twist moiré systems acts as a tuning knob for Berry curvature and quantum metric, enabling a sliding-driven nonlinear Hall effect and quantum-metric control for testing fractional Chern ins...

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