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The discovery of nonmagnetic Weyl semimetals (WSMs) in TaAs compounds hastriggered lots of efforts in finding its magnetic counterpart. While the directobservation of the Weyl nodes and Fermi arcs in a magnetic candidate throughangle-resolved photoemission spectroscopy is hindered by the complex magneticdomains. The transport features of magnetic WSMs, including negativemagnetoresistivity and anomalous Hall conductivity, are not conclusive sincethese are sensitive to extrinsic factors like defects and disorders in latticeor magnetic ordering. Here, we systematically study the temperature-dependentoptical spectra of ferromagnetic Co$_3$Sn$_2$S$_2$ experimentally and simulatedby first-principles calculations. The many-body correlation effect due to Co$3d$ electrons leads to the renormalization of bands by a factor about 1.33,which is moderate and the description within density functional theory issuitable. As the temperature drops down, the magnetic phase transition happensand the magnetization drives the band shift through exchange splitting. Theoptical spectra can well detect these changes, including the transitionssensitive and insensitive to the magnetization, and those from the bands aroundthe Weyl nodes. The results strongly support that Co$_3$Sn$_2$S$_2$ is amagnetic WSM and the Weyl nodes can be tuned by magnetization with temperaturechange.

Temperature-induced band shift in ferromagnetic Weyl semimetal Co3Sn2S2