Weichu Chen, Hao Jiang, Chengyang Du, Yueheng Zhong, Xiangyu Wang, Xiang Li, Zhu Chen, Qicheng Liang, Fengqiang Sun, Yuwen Zhu, Jian‐Gang Chen, Liang‐Wen Feng, Hongzhi Wang, Meifang Zhu, Hengda Sun, Gang Wang. "Fiber Transistors as a Hardware Surrogate Gradient for Backpropagation in Spiking Neural Networks." Advanced Materials (2026). https://doi.org/10.1002/adma.202514904