Figure 2. Calculated bulk band structure of ZrSiS.

(a) Bulk band structure without SOC, each colour of the line represents a different irreducible representation; they are labelled in the closed-up image (b). (c) Brillouin zone of a primitive tetragonal lattice; the Dirac cone line nodes along the symmetry lines are labelled in orange. (d) Bulk band structure with SOC; a very small gap is opened but the overall change to the band structure remains small. In the zoomed in panel (e) the cone at X, which is protected by non-symmorphic symmetry, is circled in red.