New<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>π</mml:mi></mml:math>-Bonded Chain Model for Si(111)-(2×1) Surface

Abstract

Several qualitatively different structural models have been examined in a critical evaluation of spectroscopic and other data for the Si(111)-(2\ifmmode\times\else\texttimes\fi{}1) surface. Within the one-electron theory, only a novel $\ensuremath{\pi}$-bonded chain model with a covalent surface, and not the generally accepted buckled model with an ionic surface, is consistent with the data.