Electronic band structure of zinc blende

The electronic bulk and surface band structure of cubic zinc sulphide (``zinc blende'') has been studied by angle-resolved photoelectron spectroscopy using synchrotron radiation. The s-p derived bands along the Γ-K-X high-symmetry direction have been determined, and the region of the Zn $3d$ line has been examined. Spectra at fixed photon energy and variation of polar electron emission angle were used to determine the dispersion of the surface states along the Γ-X̄ within the surface Brillouin zone. The experimental data for bulk and surface bands are compared with results of a recent density-functional calculation, which includes the interaction between the s-p and the cation d-derived states.