Band gap control of small bundles of carbon nanotubes using applied electric fields: A density functional theory study

Details Band gap control of small bundles of carbon nanotubes using applied electric fields: A density functional theory study Band gap control of small bundles of carbon nanotubes using applied electric fields: A density functional theory study

2010-10-05

arxiv.org/abs/1010.0785v1

Applied Physics Letters 97, 063113 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1063/1.3478237

Electrostatic screening between carbon nanotubes (CNTs) in a small CNT bundle leads to a switching behavior induced by electric field perpendicular to the bundle axis. Using a first-principles method, we investigate the electronic structures of bundles consisting of two or three CNTs and the effects of the electric field applied perpendicular to the bundle axis. The applied field causes band gap closure in semiconducting bundles, while a gap opening occurs in metallic ones, which enables considerable modulation of bundle conductivity. The modulation effect originates from symmetry breaking due to electrostatic screening between the adjacent tube walls.

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