Visualization of the 3-Dimensional Charge Order and Topological Dirac Surface Resonance in ScV₆Sn₆

Kagome metals have recently become a fertile platform for exploring the interplay between topology, electronic correlations and density-wave instabilities. Among them, ScV₆Sn₆ has emerged as a particularly clean system hosting unconventional charge ordering phenomena. In this work, we resolve the full bulk electronic structure of ScV₆Sn₆ and identify multiple Van Hove singularities (VHSs) positioned within a few meV of the Fermi level, together with a spin-polarized topological Dirac surface state at the M point. Along with the first principle calculations, the temperature-dependent ARPES spectrum resolved along the kz direction additionally provides compelling evidence for a √3×√3×3 charge order. Moreover, two of the three inequivalent VHSs are selectively suppressed, indicating an emergent electronic nematic instability that breaks rotational while preserving translational symmetry. These results disentangle the intertwined roles of CDW, VHS and topology in ScV₆Sn₆ and position this compound as a promising platform for investigating tunable symmetry-broken phases.