title: Nanowires and nanorings at the atomic level.
abstract: The step-flow growth mode is used to fabricate Si and Ge nanowires with a width of 3.5 nm and a thickness of one atomic layer (0.3 nm) by self-assembly. Alternating deposition of Ge and Si results in the formation of a nanowire superlattice covering the whole surface. One atomic layer of Bi terminating the surface is used to distinguish between the elements Si and Ge. A difference in apparent height is measured in scanning tunneling microscopy images for Si and Ge. Also, different kinds of two-dimensional Si/Ge nanostructures like alternating Si and Ge nanorings having a width of 5-10 nm were grown.
authors.affiliation: Institut für Schichten und Grenzflächen ISG 3, Forschungszentrum Jülich, 52425 Jülich, Germany.
authors.forename: Midori
authors.initials: M
authors.lastname: Kawamura
authors.forename: Neelima
authors.initials: N
authors.lastname: Paul
authors.forename: Vasily
authors.initials: V
authors.lastname: Cherepanov
authors.forename: Bert
authors.initials: B
authors.lastname: Voigtländer