Crystal structure, Kagome sublattices and van Hove singularities in kagome superconductors CsV3Sb5 (IMAGE)
Caption
a The Lattice structure of kagome metals CsV3Sb5. b Real space structure of the kagome vanadium planes. The red, blue, and green coloring indicate the three kagome sublattices. c Two distinct types of sublattice decorated van Hove singularities (VHSs) in CsV3Sb5, labeled as p-type (sublattice pure, left panel) and m-type (sublattice mixing, right panel). d Density functional theory calculated electronic structure of CsV3Sb5. The red arrows mark the VHSs. e Schematics of the conventional VHS (i) and higher-order VHS (ii) in two-dimensional electron systems. The gray curves in (e) indicate the constant energy contours that show markedly flat features along the ky direction in higher-order VHS, as highlighted by the black arrow.
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