Atomic and Electronic Structure of the 7 × 7 Reconstructed Si (111) Surface

Abstract

It is suggested that the 2\ifmmode\times\else\texttimes\fi{}1 and 7\ifmmode\times\else\texttimes\fi{}7 reconstructions of Si(111) surfaces are inherently quite similar and propose a 7\ifmmode\times\else\texttimes\fi{}7 structure based on ringlike arrangements of positively and negatively charged surface atoms. High-resolution angle-resolved photoemission data are shown to provide strong support for the buckled, (2\ifmmode\times\else\texttimes\fi{}1)-like nature of the 7\ifmmode\times\else\texttimes\fi{}7 surface.