Quantum transport in defected carbon-nanotubes

DIPC Seminars

Dario Bercioux, Freie Universitaet Berlin, Germany
Donostia International Physics Center (DIPC).Paseo Manuel de Lardizabal, 4 (nearby the Facultad de Quimica), Donostia
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Quantum transport in defected carbon-nanotubes Abstract: 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)