By using angle-resolved photoelectron spectroscopy (ARPES), we investigate the surface electronic structure of magnetic Weyl semimetal ${\mathrm{Co}}_3{\mathrm{Sn}}_2{\mathrm{S}}_2$ focusing around the $K$ points, where surface states related to Fermi arcs are predicted by density functional theory (DFT) calculations. The Fermi arc picture is sensitive to the different terminations (S, Sn, and Co). The surface states' connectivity between the Weyl points is not very clear in the S-terminated face contrary to the Sn and Co terminations, where the Fermi arcs are quite apparent exhibiting connectivity between the Weyl points located in the intra- and inter-Brillouin zones, respectively. We identify three surface states (SS1, SS2, and SS3) in our ARPES data showing resemblance to the DFT predicted surface states of S, Sn, and Co terminations. The SS2 is more robust in comparison to the SS3 against the changes developed by the thermal cycle and doping. This different behavior is possibly related to the different surface potential between the Sn- and Co-terminated surfaces. These results provide direct experimental insight about the variation of the surface state scenario among the three terminations as suggested by the DFT calculations, which could have implications on the Fermi arc stability occurring at the different surface terminations.

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• Electronic structure
• Fermi surface
• Surface states
• Weyl semimetal
• Angle-resolved photoemission spectroscopy