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Topological Dirac semimetals (TDSs) represent a new state of quantum matterrecently discovered that offers a platform for realizing many exotic physicalphenomena. A TDS is characterized by the linear touching of bulk (conductionand valance) bands at discrete points in the momentum space (i.e. 3D Diracpoints), such as in Na3Bi and Cd3As2. More recently, new types of Diracsemimetals with robust Dirac line-nodes (with non-trivial topology or near thecritical point between topological phase transitions) have been proposed thatextends the bulk linear touching from discrete points to 1D lines. In thiswork, using angle-resolved photoemission spectroscopy (ARPES), we explored theelectronic structure of the non-symmorphic crystals MSiS (M=Hf, Zr).Remarkably, by mapping out the band structure in the full 3D Brillouin Zone(BZ), we observed two sets of Dirac line-nodes in parallel with the kz-axis andtheir dispersions. Interestingly, along directions other than the line-nodes inthe 3D BZ, the bulk degeneracy is lifted by spin-orbit coupling (SOC) in bothcompounds with larger magnitude in HfSiS. Our work not only experimentallyconfirms a new Dirac line-node semimetal family protected by non-symmorphicsymmetry, but also helps understanding and further exploring the exoticproperties as well as practical applications of the MSiS family of compounds.

Dirac Line-nodes and Effect of Spin-orbit Coupling in Non-symmorphic Critical Semimetal MSiS (M=Hf, Zr)