Resolving weak moments in canted antiferromagnets via time-domain terahertz emission spectroscopy - Xuyang Sha; Tongyang Guan; Zhen Wang; Zhengkun Li; Shunjia Wang; Zhangshun Li; Chen Huang; Zuanming Jin; Zhe Yuan; Zhensheng Tao; Hangwen Guo; Jian Shen (Proceedings of the National Academy of Sciences, 2026)