Demonstration of scissor-cross ionization injection in laser wakefield accelerators. - Chen, Siyu; Lu, Guangwei; Hu, Xichen; Zhu, Mingyang; Ma, Minghao; Zeng, Ming; Xu, Hao; Wang, Jia; Wei, Mingxuan; Jia, Jiao; Yang, Zhida; Mou, Hanmi; et al. (Communications Physics, 2026)