Shandite kagome materials have attracted great research attention due to their intriguing properties, such as the magnetic Weyl semimetal phase, endless nodal lines, and pressure-induced superconductivity. In this work, by combining angle-resolved photoemission spectroscopy and ab initio calculation, we systematically investigate the electronic band structure of the shandite kagome compound $\mathrm{N}{\mathrm{i}}_3\mathrm{I}{\mathrm{n}}_2\mathrm{S}{\mathrm{e}}_2$. The measured band structure is in good agreement with ab initio calculations including the spin-orbit coupling effect. The experimental spectra are predominantly characterized by surface resonance states exhibiting highly anisotropic band dispersions near the Fermi level. These features dominate the electronic states near the Fermi level, which are likely associated with the anisotropic transport properties observed in $\mathrm{N}{\mathrm{i}}_3\mathrm{I}{\mathrm{n}}_2\mathrm{S}{\mathrm{e}}_2$. Notably, the large spin-orbit coupling in this material leads to the formation of a massive Dirac-like band dispersion in the surface resonance states, contrasting with the gapless Dirac dispersion found in the surface states of its sister compound $\mathrm{N}{\mathrm{i}}_3\mathrm{I}{\mathrm{n}}_2{\mathrm{S}}_2$. Our work will help understand the influence of the spin-orbit coupling effect on both the surface and bulk electronic states of shandite compounds. Furthermore, it establishes a foundation for exploring the potential applications of surface resonance states in surface science.

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• Surface states
• Topological materials
• Kagome metal
• Angle-resolved photoemission spectroscopy