Ultrafast Widefield Imaging of van der Waals Antiferromagnet*

Two-dimensional (2D) antiferromagnetic materials have recently emerged as promising physical platforms for realizing exotic phenomena ranging from topological magnon transport to spin-driven nano-oscillators. However due to lack of suitable techniques, the spatially resolved dynamics of the few- layer limit has remained largely unexplored. Here we report the development of a novel ultrafast optical technique that allows us to fully capture the spatio-temporal evolution of a driven antiferromagnetic system, enabling further detection of unconventional spin excitations in these platforms.