Fig. 3
Origin of the \(\bar X\) state. a Photoelectron spectrum (hν = 70 eV) on a B-terminated sample. b Electron distribution curve at \({\bar{\mathrm \Gamma }}\) obtained with hν = 32 eV. A tentative assignment of the different components is given in the sketch of a bulk-truncated B-terminated surface. c Illustrates how a displacement of the hybridization region by the observed many-body resonance shift would yield a metallic surface feature around \(\bar X\). Solid (blue) curves show the band structure adopted from Lu et al.3 Dashed (red) curves show the effect of a rigid displacement of the hybridization region to higher binding energy. d–f Corresponding results for the Sm-terminated surface
