title: Atomic and electronic structures of carbon nanotubes on Si(001) stepped surfaces.
abstract: We report first-principles total-energy calculations that provide energetics and electronic structures of adsorbed carbon nanotubes (CNTs) on stepped Si(001) surfaces. We find that adsorption energies strongly depend on the directions of CNTs, and that there are several metastable adsorption sites both on terraces and near step edges. We also find that the electronic structure of adsorbed metallic CNTs becomes semiconducting or remains metallic, depending on the adsorption site. Charge redistribution upon adsorption is prominent mainly at the CNT-surface interface.
authors.affiliation: Institute of Physics, University of Tsukuba, Tsukuba 305-8571, Japan. berber@comas.frsc.tsukuba.ac.jp
authors.forename: Savas
authors.initials: S
authors.lastname: Berber
authors.forename: Atsushi
authors.initials: A
authors.lastname: Oshiyama