States of Excitons and Linear Optical Spectra in Metallic Single-Walled Carbon Nanotubes
YU Gui-Li1** , LI Gui-Chen2** , JIA Yong-Lei3 , TANG Gang1
1 Department of Physics, China University of Mining and Technology, Xuzhou 2211162 School of Mines, and Key Laboratory of Deep Coal Resource Mining (Ministry of Education), China University of Mining and Technology, Xuzhou 2211163 College of Physics and Electronic Engineering, Xinyang Normal University, Xinyang 464000
Abstract ：Considering the exciton effect, the excitation energy and its binding energy of the metallic single-walled carbon nanotubes (SWNTs) are theoretically studied by using the simple tight-binding model, based on which the linear absorption spectra are also calculated. It is found that due to the trigonal warping effect, the excitation energies of the linear optical spectra all are split into two corresponding ones. Additionally, the splitting depends on both the chirality and the transition energy: (1) the splitting is maximal for the zigzag tubes, the splitting decreases with the increasing chiral angle; (2) the higher the transition energy is, the larger the splitting is. It is very interesting to find that the obtained results are in good agreement with the experimental results.
出版日期: 2014-08-22
:
71.35.-y
(Excitons and related phenomena)
71.35.Cc
(Intrinsic properties of excitons; optical absorption spectra)
78.67.Ch
(Nanotubes)
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2014, Vol. 31 
