曲率效应对扶手椅型碳纳米管电子性质的影响

Curvature effect on electronic properties of armchair carbon nanotubes

在考虑曲率效应对扶手椅型碳纳米管(SWNT)最近邻碳原子交叠积分影响的情况下,利用紧束缚模型和玻恩-卡门边界条件解析地推导扶手椅型SWNT的能带、态密度和电子公有化运动速度.对扶手椅型SWNT电子性质的分析发现:考虑曲率效应后扶手椅型SWNT仍然是金属管,但其能带的总能减小,其态密度的导电平台变窄且其电子公有化运动速度变小.

Considering the curvature effect on hooping of nearest-neighboring carbon atoms of armchair carbon nanotubes （ SWNT）, the energy band, density of state and velocity of electron of armchair SWNT were analytically derived by using the tight-binding model and Born-Karman boundary condition. Analyzing the electronic properties mentioned above, it is found that if considering the curvature effect, the armchair SWNT is still metal, but its total energy decreases. The conductive platform narrows and the electron velocity of armchair carbon nanotube decreases.