Exciton-phonon coupling strength in single wall carbon nanotubes

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 excit...

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Bibliographic Details
Published in:The European physical journal. B, Condensed matter physics Condensed matter physics, 2009-08, Vol.70 (4), p.469-473
Main Authors: Yu, G. L., Liang, Q. L., Jia, Y. L., Tang, G.
Format: Article
Language:English
Subjects:
Complex Systems
Condensed Matter Physics
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic structure of nanoscale materials : clusters, nanoparticles, nanotubes, and nanocrystals
Exact sciences and technology
Fluid- and Aerodynamics
Mesoscopic and Nanoscale Systems
Physics
Physics and Astronomy
Solid State Physics
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Summary: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)].
ISSN:1434-6028
1434-6036
DOI:10.1140/epjb/e2009-00259-3