Quantum-mechanical investigation of field-emission mechanism of a micrometer-long single-walled carbon nanotube.
Quantum-mechanical investigation of field-emission mechanism of a micrometer-long single-walled carbon nanotube.
复制标题
DOI：
10.1103/physrevlett.92.106803
复制
发表时间：
2004-03
影响因子：
8.6
通讯作者：
Xiao Zheng;Guanhua Chen;Zhibing Li;S. Deng;N. Xu
中科院分区：
文献类型：
--
作者：
Xiao Zheng;Guanhua Chen;Zhibing Li;S. Deng;N. Xu
采用量子力学模拟方法研究了场发射实验条件下1微米长（5，5）单壁碳纳米管上的电荷分布和静电势的沿着分布.单层碳原子被发现足以屏蔽大部分的电场，除了在尖端发生强场穿透。穿透导致发射势垒的非线性降低，这是同样负责低阈值电压除了众所周知的几何场增强因子。
A quantum-mechanical simulation is carried out to investigate the charge distribution and electrostatic potential along a 1 microm long (5,5) single-walled carbon nanotube under realistic field-emission experimental conditions. A single layer of carbon atoms is found sufficient to shield most of the electric field except at the tip where strong field penetration occurs. The penetration leads to a nonlinear decrease of potential barrier for emission, which is equally responsible for the low threshold voltage besides the well-known geometrical field enhancement factor.