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Temperature- and frequency-dependent infrared spectroscopy identifies twocontributions to the electronic properties of the magnetic kagome metalFe$_3$Sn$_2$: two-dimensional Dirac fermions and strongly correlated flatbands. The interband transitions within the linearly dispersing Dirac bandsappear as a two-step feature along with a very narrow Drude component due tointraband contribution. Low-lying absorption features indicate flat bands withmultiple van Hove singularities. Localized charge carriers are seen as aDrude-peak shifted to finite frequencies. The spectral weight is redistributedwhen the spins are reoriented at low temperatures; a sharp mode appearssuggesting the opening of a gap due to the spin reorientation as the sign ofadditional Weyl nodes in the system.

Spin-reorientation-induced band gap in Fe$_3$Sn$_2$: Optical signatures of Weyl nodes