中国物理B ›› 2011, Vol. 20 ›› Issue (1): 17302-017302.doi: 10.1088/1674-1056/20/1/017302

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Effect of vacancy defect on electrical properties of chiral single-walled carbon nanotube under external electrical field

李丰颖1, 罗煜聘2, 田力耕3, 蔡春鸿3, 李明宪4   

  1. (1)Department of Chemistry, National Chung Hsing University, Taichung, Taiwan 420, China; (2)Department of Electronic Engineering, National Formosa University, Yunlin County, Taiwan 632, China; (3)Department of Engineering and System Science, National Tsing Hua University, Hsin Chu, Taiwan 300, China; (4)Department of Physics, Tamkang University, Tamsui, Taipei County, Taiwan 251, China
  • 收稿日期:2010-05-12 修回日期:2010-06-07 出版日期:2011-01-15 发布日期:2011-01-15
  • 基金资助:
    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).

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)†   

  1. 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
  • Received:2010-05-12 Revised:2010-06-07 Online:2011-01-15 Published:2011-01-15
  • Supported by:
    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).

摘要: 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.

关键词: chiral carbon nanotube, mono-vacancy defect, energy gap, external electric field

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.

Key words: chiral carbon nanotube, mono-vacancy defect, energy gap, external electric field

中图分类号:  (Electronic structure of nanoscale materials and related systems)

  • 73.22.-f
73.63.Fg (Nanotubes) 71.15.Mb (Density functional theory, local density approximation, gradient and other corrections)