Fractional high-Chern insulator in twisted rhombohedral graphene - Zexu Li; Wenxuan Wang; Fajie Wang; Zaizhe Zhang; Qiu Yang; Kenji Watanabe; Takashi Taniguchi; X. C. Xie; Jie Wang; Kaihui Liu; Zhida Song; Xiaobo Lu (Nature, 2026)