Domain Suppression in the Negative Differential Conductivity Region of Carbon Nanotubes by Applied AC Electric Field

• 作者: Anthony Twum Chales L. Y. Amuah Kofi W. Adu Kwadwo A. Dompreh Matthew Amekpewu Musah Rabiu Natalia G. Mensah Samuel Y. Mensah Sulemana S. Abukari
• 来源期刊: 凝固态物理国际期刊(英文)
• 学科: 医学
• 关键词: Carbon NANOTUBES NEGATIVE Differential CONDUCTIVITY and Generation of TERAHERTZ Radiation
• 年，卷（期）: ngtwlgjqkyw_2012,（4）
• 页码范围: 274-277
• 页数: 4页
• 分类号: R73

摘要

We study theoretically the electron transport properties in achiral carbon nanotubes under the influence of an external electric field E(t) using Boltzmann’s transport equation to derive the current-density. A negative differential conductivity (NDC) is predicted in quasi-static approximation i.e., ωτ 0 is equal to the amplitude of the AC electric field E1. The peak of the NDC intensity occurs at very weaker fields than that of superlattice under the same conditions. The peak intensity decreases and shifts to right with the increase in the amplitude of the ac field. This mechanism suppresses the domain formation and therefore could be used in terahertz frequency generation.