Electronic surface structure of CoSi2(111)/Si(111): implications for ballistic electron-emission microscopy currents

Using a decimation technique, and imposing electrostatic self-consistency, we compute the surface electronic structure of various CoSi2(111)/Si(111) p hases. The projected band structures and LDOS indicate a richness of surfac e related features. For the (1 x 1)Co-rich termination excellent agreement with experimental data and a recent DFT investigation is obtained. Strongly localized surface states on the high chain atoms of the (2 x 1) Pandey-cha in like reconstruction are identified as causing the experimentally observe d surface topography induced contrast in Ballistic Electron Emission Micros copy (BEEM) images of such films. (C) 2000 Published by Elsevier Science B. V.