Fig. 2: DFT calculated bands, nodal lines, and Fermi surfaces of ZrSiTe.

The calculated band structures of ZrSiTe without (a) or with (b) considering the SOC effect, respectively. The calculated nodal lines in ZrSiTe without (c) or with (d) considering the SOC effect, respectively. The energy bar evolving from blue (−0.35 eV) to red (0.45 eV) are used to show the energy position of the nodes clearly. e, f Side view and top view of the calculated Fermi surfaces in the momentum space. The blue square represents the first BZ. g The calculated Fermi contour at k_z = 0. Our schematic model of Fermi contour (h), which is used later for explaining the observed FT-QPI patterns. Such a model of Fermi contour is built by comparing directly with the ARPES shown in ref. ³⁶ and our DFT results (b). The red color in our model represents the regions of high spectral density.