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The layered van der Waals ferromagnetic Fe$_3$GeTe$_2$ harbours anunconventional interplay between topology and magnetism, leading to a largeanomalous Hall conductivity at low temperatures. Here, we investigate thetemperature dependence of its charge dynamics and reveal that upon entering theferromagnetic state at $T_C \sim 200$ K and further lowering the temperaturethere is the onset of a gradual spectral weight reshuffling from themid-infrared range towards far- as well as near-infrared frequencies. Thistwo-fold spectral weight transfer indicates the important role of the Hund'scoupling as primary source for electronic correlations and signals anincoherent-coherent crossover at low temperatures. Our findings also convey theelectronic environment, based on nodal-line topological states, favouring thelarge anomalous Hall conductivity.

Electronic correlations in the van der Waals ferromagnet Fe$_3$GeTe$_2$ revealed by its charge dynamics