摘要
利用紧束缚模型中的激子波函数计算激子束缚能,并讨论了激子在单壁碳纳米管中的分布情况。详细解释了激子在碳纳米管手性角上的分布方向的依赖性,以及沿碳纳米管管轴方向上的局域性和沿管圆周方向的震荡特性。我们发现在半导体单壁碳纳米管中激子尺寸的大小总是稍大于碳纳米管的直径,并且和激子束缚能一样显示出两种依赖于螺旋角的关系。
The binding energy of an exciton using the tight- binding model was calculated, and the exciton distribution was discussed in detail. The dependence of the distribution direction of exciton on the chiral angle and the distribution localization along the tube axis and oscillating along the tube circumference were analytically explained. The size of exciton was estimated to be slightly larger than the diameter of the nanotube and it showed two family patterns versus the inverse of tube diameter as similar as in the exciton binding energy.
作者
王宝斌
董全林
李文萍
WANG Bao-bin DONG Quan-lin LI Wen-ping(Department of Physics, Beihang University, Beijing 100191 School of Instrument Science and Opticial Electronic Engineering, Beihang University, Beijing 100191, China)
出处
《广州化工》
CAS
2017年第1期12-15,50,共5页
GuangZhou Chemical Industry
关键词
激子
激子束缚能
碳纳米管
exciton
exciton binding energy
carbon nanotubes
