Honeycomb chain-channel (HCC) signature in the calcium-induced Si(111)-(3 × 2) surface

Abstract

The electronic and structural properties of a calcium-induced chain system on Si(111) have been studied. Low-energy electron diffraction measurements clearly reveal a (3 × 2) periodicity and the Ca coverage is determined to be 1/6 monolayer. Angle-resolved photoemission measurements have been performed with two different light polarizations in order to study the symmetries of the surface states. In both polarizations no band crossing the Fermi level EF is found. The three detected surface state bands are in good agreement with theoretical calculations in the honeycomb chain-channel (HCC) model for an insulating case.