Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-01-03
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 Pages, 5 Figures
Scientific paper
In carbon nanotubes, the most abundant defects, caused for example by irradiation or chemisorption treatments, are small perturbing clusters, i.e. bi-site defects, extending over both A and B sites. The relative positions of these perturbing clusters play a crucial role in determining the electronic properties of carbon nanotubes. Using bandstructure and electronic transport calculations, we find out that in the case of armchair metallic nanotubes a band gap opens up when the clusters fulfill a certain periodicity condition. This phenomenon might be used in future nanoelectronic devices in which certain regions of single metallic nanotubes could be turned to semiconducting ones. Although in this work we study specifically the effect of hydrogen adatom clusters, the phenomenon is general for different types of defects. Moreover, we study the influence of the length and randomness of the defected region on the electron transport through it.
Hashemi Mohammad Javad
Puska Martti J.
Sääskilahti Kimmo
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