Figure 1: Characterization of the YbB12(001) clean surface.
From: Surface Kondo effect and non-trivial metallic state of the Kondo insulator YbB12
(a) Crystal structure of YbB12 (ref. 28). (b) A LEED pattern of the clean YbB12(001) surface at room temperature. Arrows indicate the surface unit vectors. (c–e) Angle-integrated photoelectron spectra taken at 20 K with photon energies at (c) 80, (d) 280/1,000 and (e) 80/500 eV. In (e) the spectrum taken at 80 is convolved with a Gaussian (full-width at half-maximum of 75 meV) for comparison with other spectra at 500 eV taken with lower energy resolution. (f) Schematic drawing of the three-dimensional Brillouin zone of the YbB12 single crystal and its projection onto the (001) SBZ.
