Differential Reflectivity of Si(111) 2×1 Surface with polarized light: a test for surface structure

The polarization dependence of the differential reflectivity of the Si(111)2×1 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 [01? 1] directions. The chain model is in good agreement with the experimental result.