Nonequilibrium Spin–Lattice Dynamics in FePS₃ from THz to Visible Excitations

Understanding spin–lattice coupling is essential for controlling intertwined degrees of freedom in quantum materials. In van der Waals magnets, this coupling gives rise to unconventional magnetic phases and exotic collective excitations. Ultrafast optical spectroscopy provides a powerful route to disentangle the transient dynamics of spins, phonons, and charge carriers on their intrinsic timescales. Here, we investigate the light-induced nonequilibrium dynamics of the van der Waals antiferromagnet FePS₃ over a broad pump spectral range from the terahertz to the visible. We will discuss the coupling between the dynamics of magnons and phonons, offering new insights into spin–lattice interactions in layered magnets.