SURFACE BAND-STRUCTURE OF CDTE(111)-2X2 BY ANGLE-RESOLVED PHOTOEMISSION

The surface band structure of non-cleavable CdTe(111)-2 x 2 reconstructed surfaces is determined by means of angle-resolved photoemission and constant-final-state (CFS) spectroscopy. The experiments were performed with He I radiation and synchrotron radiation from the DORIS II storage ring at HASYLAB. High-quality (111)-2 x 2 surfaces were prepared by sputtering and annealing controlled by electron diffraction (LEED and RHEED). In order to distinguish between surface and bulk related emissions in the spectra we utilized, besides the criteria that the k parallel-to dispersion of surfacve states should reveal the 2 x 2 periodicity of the surface mesh, also photon energy dependent CFS series at several critical points of the surface Brillouin zone. The data on CdTe(111) will be compared with experimental and theoretical results which are available for the electronically similar GaAs(111) surface.