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We have performed angle-resolved photoemission spectroscopy on HfSiS, whichhas been predicted to be a topological line-node semimetal with square Silattice. We found a quasi-two-dimensional Fermi surface hosting bulk nodallines, alongside the surface states at the Brillouin-zone corner exhibiting asizable Rashba splitting and band-mass renormalization due to many-bodyinteractions. Most notably, we discovered an unexpected Dirac-like dispersionextending one-dimensionally in k space - the Dirac-node arc - near the bulknode at the zone diagonal. These novel Dirac states reside on the surface andcould be related to hybridizations of bulk states, but currently we have noexplanation for its origin. This discovery poses an intriguing challenge to thetheoretical understanding of topological line-node semimetals.

Unexpected Dirac-Node Arc in the Topological Line-Node Semimetal HfSiS