Sub-100 Femtosecond All-Optical Modulation Beyond Electron–Phonon Limits. - Gao, Renxian; Li, Jiayu; Dong, Xiaoxiang; He, Yonglin; Chen, Wenbin; Ren, Peiwen; Zhao, Xiaoyu; Li, Ming-De; Yang, Zhilin (Nano-Micro Letters, 2026)