Exciton-phonon coupling strength in single wall carbon nanotubes

被引：2
|
作者：
Yu, G. L. [1 ]
Liang, Q. L. [2 ]
Jia, Y. L. [3 ,4 ]
Tang, G. [1 ]
机构：
[1] China Univ Min & Technol, Dept Phys, Xuzhou 221008, Peoples R China
[2] Shaoxing Coll Arts & Sci, Dept Phys, Shaoxing 312000, Peoples R China
[3] Nanjing Univ, Grp Computat Condensed Matter Phys, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China
[4] Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China
来源：
EUROPEAN PHYSICAL JOURNAL B | 2009年 / 70卷 / 04期
关键词：
OPTICAL-SPECTRA; ENERGIES;
D O I：
10.1140/epjb/e2009-00259-3
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
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 E-22 exciton-phonon coupling strength is found to be slightly smaller than that of E-11 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)].
引用
收藏
页码：469 / 473
页数：5
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