title: Hole-electron competition with fast and slow gratings in Bi(12)SiO(20) crystals.
abstract: Two samples of nominally pure Bi(12)SiO(20) show distinct behavior in experiments of diffraction efficiency kinetics, and two-beam coupling. The results can be understood by the presence of fast and slow gratings due to electrons and holes.
authors.forename: L M
authors.initials: LM
authors.lastname: Bernardo
authors.forename: J C
authors.initials: JC
authors.lastname: Lopes
authors.forename: O D
authors.initials: OD
authors.lastname: Soares