### Abstract

The electronic structure and dielectric screening of finite-length armchair carbon nanotubes are studied within a tight-binding model, which well captures the oscillation pattern of the band gap as the tube length increases. We find that: (1) the parallel screening constant ε _{||} grows almost linearly with the length and shows little dependence on the band gap; (2) the perpendicular screening is strongly related to the band gap and ε _{⊥} converges to its bulk value when the length exceeds tens of radius. Our method is employed to study the depolarization effect of a short (6,6) nanotube in a wet environment, when water is inside the tube. This situation is of interest for biomimctic uses of carbon nanotubes.

Original language | English (US) |
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Title of host publication | 2004 4th IEEE Conference on Nanotechnology |

Pages | 273-275 |

Number of pages | 3 |

State | Published - Dec 1 2004 |

Event | 2004 4th IEEE Conference on Nanotechnology - Munich, Germany Duration: Aug 16 2004 → Aug 19 2004 |

### Publication series

Name | 2004 4th IEEE Conference on Nanotechnology |
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### Other

Other | 2004 4th IEEE Conference on Nanotechnology |
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Country | Germany |

City | Munich |

Period | 8/16/04 → 8/19/04 |

### All Science Journal Classification (ASJC) codes

- Engineering(all)

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## Cite this

*2004 4th IEEE Conference on Nanotechnology*(pp. 273-275). (2004 4th IEEE Conference on Nanotechnology).