期刊
APPLIED PHYSICS LETTERS
卷 97, 期 6, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3478237
关键词
ab initio calculations; carbon nanotubes; crystal symmetry; density functional theory; energy gap
资金
- Kyung Hee University [KHU-20100119]
- DOE [DE-FG02-98ER45685]
- U.S. Department of Energy (DOE) [DE-FG02-98ER45685] Funding Source: U.S. Department of Energy (DOE)
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. (C) 2010 American Institute of Physics. [doi:10.1063/1.3478237]
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