Superconductivity and van Hove singularities confined to the surface of a topological semimetal

The interplay between electronic topology and superconductivity is a subject of great current interest in condensed matter physics. For example, superconductivity induced on the surface of topological insulators is predicted to be triplet in nature. Here, we propose to use the advanced angle resolved photoemission spectroscopy beamline (LOREA) at ALBA to study an unconventional two‐dimensional superconducting state in a Dirac nodal line semimetal. Based on DFT calculations and preliminary ARPES data, we find two‐dimensional van Hove singularities near the Fermi energy. The proximity of van Hove singularities to the Fermi level leads to enhanced electronic correlations contributing to the stabilization of superconductivity at the surface of the crystal. The surface confined nature of the van Hove singularities and associated superconductivity opens new avenues to explore the interplay between low‐dimensional quantum topology, correlations, and superconductivity in a bulk material.