| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Effect of vacancy defect on electrical properties of chiral single-walled carbon nanotube under external electrical field |
| Luo Yu-Pin(罗煜聘)a), Tien Li-Gan(田力耕)b), Tsai Chuen-Horng(蔡春鸿)b), Lee Ming-Hsien(李明宪)c), and Li Feng-Yin(李丰颖) d)† |
| a Department of Electronic Engineering, National Formosa University, Yunlin County, Taiwan 632, China; b Department of Engineering and System Science, National Tsing Hua University, Hsin Chu, Taiwan 300, China; c Department of Physics, Tamkang University, Tamsui, Taipei County, Taiwan 251, China; d Department of Chemistry, National Chung Hsing University, Taichung, Taiwan 420, China |
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Abstract Ab initio calculations demonstrated that the energy gap modulation of a chiral carbon nanotube with mono-vacancy defect can be achieved by applying a transverse electric field. The bandstructure of this defective carbon nanotube varying due to the external electric field is distinctly different from those of the perfect nanotube and defective zigzag nanotube. This variation in bandstructure strongly depends on not only the chirality of the nanotube and also the applied direction of the transverse electric field. A mechanism is proposed to explain the response of the local energy gap between the valence band maximum state and the local gap state under external electric field. Several potential applications of these phenomena are discussed.
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Received: 12 May 2010
Revised: 07 June 2010
Accepted manuscript online:
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PACS:
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73.22.-f
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(Electronic structure of nanoscale materials and related systems)
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73.63.Fg
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(Nanotubes)
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71.15.Mb
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(Density functional theory, local density approximation, gradient and other corrections)
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| Fund: Project supported by the National Science Council (NSC) of Taiwan, China, FYL supported by the NSC (Grant No. 96-2113-M-005-008-MY3), MHL supported by the NSC (Grant No. 95-2112-M-032-015) and also CHT supported by the NSC (Grant No. 95-2120-M-007-007). |
Cite this article:
Luo Yu-Pin(罗煜聘), Tien Li-Gan(田力耕), Tsai Chuen-Horng(蔡春鸿), Lee Ming-Hsien(李明宪), and Li Feng-Yin(李丰颖) Effect of vacancy defect on electrical properties of chiral single-walled carbon nanotube under external electrical field 2011 Chin. Phys. B 20 017302
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