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Tunable Fractional Chern Insulators in Rhombohedral Graphene Superlattices

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arxiv 2405.16944 v2 pith:BHPFAYJM submitted 2024-05-27 cond-mat.mes-hall cond-mat.str-el

Jian Xie , Zihao Huo , Xin Lu , Zuo Feng , Zaizhe Zhang , Wenxuan Wang , Qiu Yang , Kenji Watanabe
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Takashi Taniguchi Kaihui Liu Zhida Song X.C. Xie Jianpeng Liu Xiaobo Lu
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classification cond-mat.mes-hallcond-mat.str-el
keywords magneticfieldhallmoirefractionalsuperlatticescherngraphene
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Fractional Chern insulators (FCIs) showing a transport effect with fractionally quantized Hall plateaus emerging under zero magnetic field, provide a radically new opportunity to engineer topological quantum electronics. By construction of topological flat band with moire engineering, intrinsic FCIs have been observed in twisted MoTe2 system and rhombohedral pentalayer graphene/hBN moire superlattices with anomalous Hall resistivity quantization number C <= 2/3 including the gapless composite Fermi-liquid state with C = 1/2. Here, we experimentally demonstrate a new system of rhombohedral hexalayer graphene (RHG)/hBN moire superlattices, which exhibit both integer and fractional quantum anomalous Hall effects with rich tunability including electric displacement field, perpendicular magnetic field and in-plane magnetic field. By tuning the electrical and magnetic fields at 0 < v < 1, we have observed a quantum phase transition showing a sign reversal of the Hall resistivity at finite magnetic fields. Surprisingly, the FCI state at v = 2/3 survives in the phase transitions, exhibiting a robust quantized Hall resistivity across both phases. Finally we have further demonstrated the indispensable role moire potential plays in the formation of the flat Chern band from a theoretical perspective. Our work has established RHG/hBN moire superlattices as a promising platform for exploring quasi-particles with fractional charge and non-Abelian anyons at zero magnetic field.

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Cited by 9 Pith papers

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

  1. Surface-Selective Probe of Spin-Triplet Superconductivity in Rhombohedral Graphene

    cond-mat.mes-hall 2026-08 conditional novelty 7.0 of 10

    A one-sided WS2 layer suppresses superconductivity in rhombohedral pentalayer graphene precisely when the pairing carriers are pushed toward it, providing evidence for spin-triplet pairing.

  2. Chern-Selective multi-valley Flat Bands in Twisted Mono-Bilayer and Mono-Trilayer MoTe$_2$

    cond-mat.mtrl-sci 2025-10 conditional novelty 7.0 of 10

    In twisted mono-bilayer and mono-trilayer MoTe2, Γ and K/K' valley moiré flat bands coexist at low energy, with layer number and stacking controlling their alignment and quantum geometry.

  3. Robustness of real-space topology in moir\'e systems

    cond-mat.mes-hall 2025-06 conditional novelty 7.0 of 10

    The real-space Chern number of ensembles of Bloch states is robust and symmetry-forced to be nonzero in twisted TMDs and twisted bilayer graphene.

  4. Rhombohedral Graphene: A Tale of Many Crystals

    cond-mat.str-el 2026-07 conditional novelty 6.0 of 10

    A Mexican-hat band dispersion in rhombohedral graphene is predicted to stabilize four electron-crystal phases—Wigner, nodal Wigner, self-doped 'phantom' crystal, and hole-lattice 'anticrystal'—mapped over density and ...

  5. Correlated states in charge-transfer heterostructures based on rhombohedral multilayer graphene

    cond-mat.str-el 2026-01 conditional novelty 6.0 of 10

    A self-consistent screening theory models gate-tunable graphene-insulator heterostructures and predicts Wigner-crystal superlattice-induced Chern insulators and interlayer excitonic insulators.

  6. Relaxation and Its Effects on Electronic Structure in Twisted Systems: An Analytical Perspective

    cond-mat.mtrl-sci 2025-09 conditional novelty 6.0 of 10

    Closed-form relaxation fields plus a phase-factor series expansion map lattice relaxation into continuum-model hoppings, reproducing the tMoTe2 topological transition near 3 degrees and magic-angle graphene flat bands...

  7. Quantum Geometry in the NbSe$_2$ Family I: Obstructed Compact Wannier Function and New Perturbation Theory

    cond-mat.mes-hall 2025-07 conditional novelty 6.0 of 10

    Monolayer NbSe2's Fermi-level flat band is an obstructed atomic band whose Wannier function is 94% reproduced by a compact three-site orbital, and its minimal model has next-nearest-neighbor hopping larger than neares...

  8. MoireStudio: A Universal Twisted Electronic Structure Calculation Package

    cond-mat.mtrl-sci 2026-02 conditional novelty 5.0 of 10

    MoireStudio is a Python package that finds commensurate moiré angles, builds tight-binding and k·p Hamiltonians, and includes Fourier-based relaxation for twisted 2D materials.

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