Fano Resonance and Orbital Filtering in Multiply Connected Carbon Nanotubes

Details Fano Resonance and Orbital Filtering in Multiply Connected Carbon Nanotubes Fano Resonance and Orbital Filtering in Multiply Connected Carbon Nanotubes

2004-02-26

arxiv.org/abs/cond-mat/0402639v4

Phys. Rev. B 71, 205415 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.71.205415

We investigate the electron transport in multiply connected metallic carbon nanotubes within the Landauer-B\"{u}ttiker formalism. Quasibound states coupled to the incident $\pi^{*}$ states give rise to energy levels of different widths depending on the coupling strength. In particular, donorlike states originating from heptagonal rings are found to give a very narrow level. Interference between broad and narrow levels produces Fano-type resonant backscattering as well as resonant tunneling. Over a significantly wide energy range, almost perfect suppression of the conduction of $\pi^{*}$ electrons occurs, which may be regarded as filtering of particular electrons ($\pi$-pass filter).

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