Fig. 3. The type-II Dirac nodal lines in RbTi₃Bi₅.

a, b Calculated bulk bands along Γ-M and L-A, respectively. The α-ε mark the first to fifth band from Γ to M point. The β and γ bands forming type-II Dirac cone are highlighted by red lines. c Schematic of momentum locations of type-II Dirac nodal lines (red curves, extracted from the calculation in Supplementary Fig. 7) and cut lines along different k_z position (blue dash lines) in the bulk BZ. d ARPES intensity plots cut along the $\overline{\mathrm{\Gamma }}$-$\overline{M}$ direction at selected k_z positions with photon energies region from 57~66 eV (k_z = π, 3π/4, π/2, π/4 and 0). Orange dots denote the position of type-II Dirac nodes. e The stacking constant energy k_x-k_z maps along $\overline{\mathrm{\Gamma }}$-$\overline{M}$ direction taken at selected energies (E_F to E_F-0.4 eV). The red arrows denote the γ and β bands, the grey planes denote the 3D band dispersion along k_z direction. The c in k_z unit represents the out-of-plane lattice constant.