"Quantum transport in defected carbon-nanotubes"

Who: Dario Bercioux, Freie Universitaet Berlin, Germany

Place: Donostia International Physics Center (DIPC).Paseo Manuel de Lardizabal, 4 (nearby the Facultad de Quimica), Donostia

Date: Friday, 24 January 2014, 12:00


A single-walled carbon nanotube is a  piece of graphene - a single layer of carbon atoms arranged in a honeycomb lattice - rolled into a hollow cylinder with nano metric
diameter and micrometric length. Nanotubes have attracted a continuously increasing interest of scientists in view of the possibility to study new and previously unexplored
phenomena peculiar to one-dimensional metallic conductors.

In  this talk I shall present a detailed comparison between theoretical predictions on electron scattering processes in metallic single-walled carbon nanotubes with
defects and experimental data obtained by scanning tunneling spectroscopy of nanotubes irradiated with Ar-ions. The theoretical model that I shall present
reproduces the features of the particle-in-a-box-like states observed experimentally. Furthermore, the comparison between theoretical and experimental  local density of states yields clear signatures for inter- and intra-valley electron scattering processes depending on the tube chirality.

For the case of armchair single-walled carbon nanotubes, electron scattering depends on the interplay between tube and defect symmetries.  Particularly, I shall show that the conservation of the pseudo-spin and particle-hole symmetry play a crucial role. These last results pave the way for a possible pseudo-spin filter device.

G. Buchs, DB, et al., Phys. Rev. Lett. 102, 245505(2009)
DB et al., Phys. Rev. B 83, 165439 (2011)
L. Mayrhofer and DB, Phys. Rev. B 84, 115126 (2011)

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