Superconductivity and a van Hove singularity confined to the surface of a topological semimetal
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This paper reported a two-dimensional superconducting state confined to the surface of the nodal-line semimetal ZrAs$_2$, together with a surface-localized van Hove singularity near the Fermi level. The transport, spectroscopy, and theory results pointed to an unusual surface-driven superconducting regime and provided a clean platform for studying the interplay between low-dimensional topology, enhanced correlations, and superconductivity.
The published paper can be found here.