Exciton-phonon coupling strength in single wall carbon nanotubes

被引：0
|
作者：
G. L. Yu
Q. L. Liang
Y. L. Jia
G. Tang
机构：
[1] China University of Mining and Technology,Department of Physics
[2] Department of Physics,Group of Computational Condensed Matter Physics, National Laboratory of Solid State Microstructures and Department of Physics
[3] Nanjing University,undefined
来源：
The European Physical Journal B | 2009年 / 70卷
关键词：
71.35.-y Excitons and related phenomena; 71.35.Cc Intrinsic properties of excitons; optical absorption spectra; 78.67.Ch Nanotubes;
D O I：
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中图分类号：
学科分类号：
摘要：
The coupling strength of the exciton and different phonons, including the radial breathing mode (RBM), longitudinal (LO) and transverse (TO) optical phonons, are calculated for different diameter single wall carbon nanotubes (SWNTs) in the framework of tight-binding model. It is found that the exciton-phonon coupling strength with the LO mode or RBM shows a clear (2n+m)-family behavior due to the trigonal warping effect, but it with the TO mode remains to be zero. In the same SWNT, the E22 exciton-phonon coupling strength is found to be slightly smaller than that of E11 exciton. Finally, the exciton-RBM-phonon coupling strengths for several SWNTs are found to be in good agreement with the recent experimental data [Phys. Rev. Lett. 98, 037405 (2007)].
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页码：469 / 473
页数：4
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