title: Reflectance anisotropy spectra of the diamond (100)-(2x1) surface: evidence of strongly bound surface state excitons.
abstract: We compare the results of ab initio calculations with measured reflection anisotropy spectra and show that strongly bound surface-state excitons occur on the clean diamond (100) surface. These excitons are found to have a binding energy close to 1 eV, the strongest ever observed at a semiconductor surface. Important electron-hole interaction effects on the line shape of the optical transitions above the surface-state gap are also found.
authors.affiliation: Dipartimento di Fisica-Universitá di Roma, Tor Vergata and Istituto Nazionale per la Fisica della Materia, I-00133 Rome, Italy.
authors.forename: Maurizia
authors.initials: M
authors.lastname: Palummo
authors.forename: Olivia
authors.initials: O
authors.lastname: Pulci
authors.forename: Rodolfo
authors.initials: R
authors.lastname: Del Sole
authors.forename: Andrea
authors.initials: A
authors.lastname: Marini
authors.forename: M
authors.initials: M
authors.lastname: Schwitters
authors.forename: S R
authors.initials: SR
authors.lastname: Haines
authors.forename: K H
authors.initials: KH
authors.lastname: Williams
authors.forename: D S
authors.initials: DS
authors.lastname: Martin
authors.forename: P
authors.initials: P
authors.lastname: Weightman
authors.forename: J E
authors.initials: JE
authors.lastname: Butler