First-principles study of field emission of carbon nanotubes

被引：65
|
作者：
Han, SW [1 ]
Ihm, J
机构：
[1] Seoul Natl Univ, Sch Phys, Seoul 151742, South Korea
[2] Princeton Univ, Princeton Mat Inst, Princeton, NJ 08544 USA
来源：
PHYSICAL REVIEW B | 2002年 / 66卷 / 24期
关键词：
D O I：
10.1103/PhysRevB.66.241402
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Field emission properties of the (10,10) carbon nanotube are investigated with a first-principles approach. Emission currents are obtained through integrations of the time-dependent Schrodinger equation. We find that the emission current from the states localized at the tip end is more than ten times greater than direct contributions from extended metallic (pi and pi*) states. The spatial distribution of the electronic wave function as it tunnels through the energy barrier is shown in time sequence. The simulated image on the screen shows a pentagonal pattern in agreement with experiment.
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页码：1 / 4
页数：4
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