title: Room temperature peierls distortion in small diameter nanotubes.
abstract: By means of ab initio simulations, we investigate the phonon band structure and electron-phonon coupling in small 4-A diameter nanotubes. We show that both the C(5,0) and C(3,3) tubes undergo above room temperature a Peierls transition mediated by an acoustical long wavelength and an optical q=2k(F) phonon, respectively. In the armchair geometry, we verify that the electron-phonon coupling parameter lambda originates mainly from phonons at q=2k(F) and is strongly enhanced when the diameter decreases. These results question the origin of superconductivity in small diameter nanotubes.
authors.affiliation: Laboratoire de Physique de la Matière Condensée et des Nanostructures, CNRS and Université Claude Bernard Lyon I, Bâtiment Brillouin, 43 Bd du 11 Novembre 1918, 69622 Villeurbanne Cedex, France.
authors.forename: D
authors.initials: D
authors.lastname: Connétable
authors.forename: G-M
authors.initials: GM
authors.lastname: Rignanese
authors.forename: J-C
authors.initials: JC
authors.lastname: Charlier
authors.forename: X
authors.initials: X
authors.lastname: Blase