Fig. 6: Out-of-plane ARPES data for GaN(1000) along the ГA direction.
From: High-energy photoemission final states beyond the free-electron approximation
a Dispersions expected from the DFT valence bands and FE final states with V0 = 5 eV. With the non-symmorphic space group of bulk GaN, the dispersions allowed by the dipole selection rules are shown bold; b, c Measured in the \({\bar{\varGamma }}_{0}\) and \({\bar{\varGamma }}_{1}\) points of two surface BZs (note slightly shifted hv scales). The experiment clearly resolves individual final-state bands (marked by arrows) whose separation in kz is larger than the intrinsic Δkz broadening.
