Fig. 1: Crystal and electronic structures of bulk single-crystal GdMn6Sn6.
From: Double exchange interaction in Mn-based topological kagome ferrimagnet
a The crystal structure of GdMn6Sn6. Kagome lattice structure formed by Mn (blue) atoms in the a-b plane, sandwiched between Gd (black) and Sn (red) atoms. b The sketch illustrates the tight-binding (TB) model on a kagome lattice with nearest-neighbor (NN) in-plane hopping. c Schematic 2D band structure of kagome lattice from TB model. d Bulk and projected surface Brillouin Zone (BZ) of GdMn6Sn6 with marked high-symmetry points. e Experimental band structure along the \(\bar{K}-\bar{\Gamma }-\bar{K}\) high symmetry. The flat band appears clearly, as indicated by the red arrows. f Energy distribution curves (EDC) from experiments along the \(\bar{\Gamma }-\bar{K}\) direction, showing the flat band approximately 0.5 eV below the Fermi level (\({E}_{F}\)).
