Engineering topology and correlation in twisted rhombohedral graphene

Rhombohedral graphene moiré systems have recently emerged as fertile ground for exploring correlated and topological quantum phases, exhibiting phenomena such as fractional quantum anomalous Hall effect [1], extended quantum anomalous Hall effect [2], etc. Yet, the microscopic origins of these states remain elusive, partly due to the intricate influence of alignment with hexagonal boron nitride [3]. Understanding topology in purely graphene-based rhombohedral moiré systems is therefore of central interest. Here we investigate transport properties in twisted rhombohedral graphene, where the interlayer twist angle and displacement field enable control over electronic bandwidth and topology, revealing correlated insulating states and electrically switchable Hall responses. Our results highlight twisted rhombohedral graphene as a versatile system for engineering topology and correlation in moiré quantum matter.

[1] Nature 626, 759–764 (2024).

[2] Nature 637, 1090–1095 (2025).

[3] arXiv preprint arXiv:2507.20647 (2025).