Room temperature Peierls distortion in small radius nanotubes
arXiv:cond-mat/0501113 · doi:10.1103/PhysRevLett.94.015503
Abstract
By means of {\it ab initio} simulations, we investigate the phonon band structure and electron-phonon coupling in small 4-Ådiameter 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 phonons respectively. In the armchair geometry, we verify that the electron-phonon coupling parameter originates mainly from phonons at and is strongly enhanced when the diameter decreases. These results question the origin of superconductivity in small diameter nanotubes.
submitted 21oct2004 accepted 6jan2005 (Phys.Rev.Lett.)