Coulomb effects on the fundamental optical transition in semiconducting single-walled carbon nanotubes: Divergent behavior in the small-diameter limit
Coulomb effects on the fundamental optical transition in semiconducting single-walled carbon nanotubes: Divergent behavior in the small-diameter limit
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DOI：
10.1103/physrevb.65.241407
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发表时间：
2002-06
影响因子：
3.7
通讯作者：
M. Ichida;S. Mizuno;Y. Saito;H. Kataura;Y. Achiba;A. Nakamura
中科院分区：
文献类型：
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作者：
M. Ichida;S. Mizuno;Y. Saito;H. Kataura;Y. Achiba;A. Nakamura
实验研究了半导体单壁碳纳米管中库仑效应对光学跃迁的影响。与紧束缚模型计算的跃迁能相比，由于最低带间跃迁而产生的吸收带向更高能量侧移动。由库仑效应引起的蓝移随着管径d的减小而增大，d - 1，3。我们发现，这种依赖性归因于带隙的增加和激子结合能的增强与直径的减小。
We have experimentally investigated the diameter dependence of Coulomb effects on the optical transition in semiconducting single-walled carbon nanotubes. The absorption band due to the lowest band-to-band transition shifts to the higher-energy side compared to the transition energy calculated by a tight-binding model. The blueshift originating from the Coulomb effect increases with decreasing tube diameter d as d - 1 , 3 . We have found that this dependence is attributed to both the increase of the band gap and the enhancement of the exciton binding energy with a decrease of the diameter.