Differential Reflectivity of Si(111)2×1 Surface with Polarized Light: A Test for Surface Structure

Abstract

The polarization dependence of the differential reflectivity of the Si(111)2\ifmmode\times\else\texttimes\fi{}1 single-domain surface has been studied experimentally. A marked anisotropy of the optical peak at 0.45 eV associated with dangling bonds is observed with maximum absorption along $[0\overline{1}1]$ directions. The chain model is in good agreement with the experimental result.