Abstract
The surface electronic structure was studied using angle-resolved photoelectron spectroscopy together with synchrotron radiation. We identify three surface states occurring in the gaps of the projected bulk bands. The highest level state, located at binding energy is consistent with previous findings. The second and third states, located at and 4.3 eV, have not been reported previously. All three of these surface states show no discernible dispersion as compared to the surface states on and This result suggests that the elements of the surface unit cells are more isolated from each other than they are for the or the surface.
- Received 2 June 1997
DOI:https://doi.org/10.1103/PhysRevB.57.10132
©1998 American Physical Society