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Crystal geometry can greatly influence the emergent properties of quantummaterials. As an example, the kagome lattice is an ideal platform to study therich interplay between topology, magnetism, and electronic correlation. In thiswork, combining high-resolution angle-resolved photoemission spectroscopy andab-initio calculation, we systematically investigate the electronic structureof XMn6Sn6 (X = Dy, Tb, Gd, Y) family compounds. We observe the Dirac fermionand the flat band arising from the magnetic kagome lattice of Mn atoms.Interestingly, the flat band locates in the same energy region in all compoundsstudied, regardless of their different magnetic ground states and 4f electronicconfigurations. These observations suggest a robust Mn magnetic kagome latticeacross the XMn6Sn6 family, thus providing an ideal platform for the search andinvestigation on new emergent phenomena in magnetic topological materials.

Robust Kagome Electronic Structure in Topological Quantum Magnets XMn6Sn6 (X = Dy, Tb, Gd, Y)