Tunable topological correlated physics in rhombohedral graphene and beyond
ORAL · Invited
Abstract
In crystalline solids, the interplay between topology and interactions can lead to various exotic topological correlated states, i.e., the recently discovered fractional Chern insulators (FCIs). Graphene based topological flat-bands provide a clean and highly tunable platform to investigate these states. In this talk, I will introduce our recent experiments on the observation of FCIs and other emergent correlated phenomena in rhombohedral hexalayer graphene (RHG)/hBN moiré superlattices. Such FCIs exhibit unconventional orbital magnetism and are extremely sensitive to in-plane magnetic field, indicating a non-neglectable spin-orbit coupling. Moreover, I will demonstrate how moiré effects and quantum fluctuations shape the RHG/hBN phase diagram.
*This work was supported by the National Key R&D Program (Grant nos. 2022YFA1403500/02 and 2024YFA1409002), the National Natural Science Foundation of China (Grant Nos. 12274006, 12141401, 52025023 and 12427806), the JSPS KAKENHI (Grant nos. 21H05233 and 23H02052) and World Premier International Research Center Initiative (WPI), MEXT, Japan.
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Publication: arXiv:2510.15309 (2025)
arXiv:2506.01485 (2025)
arXiv:2507.10875 (2025)
Nature Materials 24,1042–1048 (2025)
Presenters
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Xiaobo Lu
- Peking University