title: High-frequency EPR and ENDOR spectroscopy on semiconductor nanocrystals.
abstract: EPR and ENDOR experiments at 95 GHz on ZnO nanoparticles reveal the presence of shallow donors related to interstitial Li and Na atoms. The experiments allowed, for the first time, to probe the effect of confinement on the shape of the electronic wave function. In addition, it is observed that the 67Zn nuclear spins become polarized upon saturation of the EPR transition. This Overhauser effect is induced by the zero-point vibrations of the phonon system in the nanoparticles.
authors.affiliation: Department of Molecular Physics, Huygens Laboratory, Leiden University, 2300 RA Leiden, The Netherlands.
authors.forename: S B
authors.initials: SB
authors.lastname: Orlinskii
authors.forename: H
authors.initials: H
authors.lastname: Blok
authors.forename: E J J
authors.initials: EJ
authors.lastname: Groenen
authors.forename: J
authors.initials: J
authors.lastname: Schmidt
authors.forename: P G
authors.initials: PG
authors.lastname: Baranov
authors.forename: C
authors.initials: C
authors.lastname: de Mello Donegá
authors.forename: A
authors.initials: A
authors.lastname: Meijerink