title: Bulk excitonic effects in surface optical spectra.
abstract: We calculate the surface optical properties of the passivated Si(110) surface using a real-space multigrid technique and ab initio pseudopotentials. Rather than from the usual eigenvalue representation, the macroscopic polarizability is obtained from the solution of an initial-value problem, which allows inclusion of excitonic and local-field effects in addition to the electronic self-energy in the surface calculations. It is shown that the electron-hole attraction is largely responsible for the peculiar line shape of the surface reflectance anisotropy.
authors.affiliation: Institut für Festkörpertheorie und Theoretische Optik, Friedrich-Schiller-Universität, Max-Wien-Platz 1, 07743 Jena, Germany.
authors.forename: P H
authors.initials: PH
authors.lastname: Hahn
authors.forename: W G
authors.initials: WG
authors.lastname: Schmidt
authors.forename: F
authors.initials: F
authors.lastname: Bechstedt