Fig. 1
Massive nature of the \({\bar{\mathrm \Gamma }}\) state. Photoemission intensity (I) along a \({\bar{\mathrm \Gamma }}\) − \(\bar X\) and b \({\bar{\mathrm \Gamma }}\) − \(\bar M\) for the B-terminated surface. c The Fermi surface for B termination. d Photoemission intensity along \({\bar{\mathrm \Gamma }}\) – \(\bar X\) on a pristine and aged B-terminated surface. e Photoemission spectra at \({\bar{\mathrm \Gamma }}\) of the pristine (blue) and aged (light blue) surface. f Photoemission intensity along \({\bar{\mathrm \Gamma }}\) – \(\bar X\) on a Sm-terminated sample. Data in f, g, i obtained at 40 K to populate a larger fraction of the shallow \({\bar{\mathrm \Gamma }}\) state. Results have been divided by a Fermi-Dirac distribution. g, h Second derivative (d2I/dE2) of the photoemission intensity in the rectangular areas marked in f, a. i, j \({\bar{\mathrm \Gamma }}\) state represented as spectra for Sm and B termination. hν = 31 eV, s-polarization
