title: Dynamics of exciton formation at the Si(100) c(4 x 2) surface.
abstract: Carrier recombination at the Si(100) c(4 x 2) surface and the underlying surface electronic structure is unraveled by a combination of two-photon photoemission and many-body perturbation theory: An electron excited to the silicon conduction band by a femtosecond infrared laser pulse scatters within 220 ps to the unoccupied surface band, needs 1.5 ps to jump to the band bottom via emission of optical phonons, and finally relaxes within 5 ps with an excited hole in the occupied surface band to form an exciton living for nanoseconds.
authors.affiliation: Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstrasse 7, D-91058 Erlangen, Germany. weinelt@physik.uni-erlangen.de
authors.forename: Martin
authors.initials: M
authors.lastname: Weinelt
authors.forename: Michael
authors.initials: M
authors.lastname: Kutschera
authors.forename: Thomas
authors.initials: T
authors.lastname: Fauster
authors.forename: Michael
authors.initials: M
authors.lastname: Rohlfing