Exciton-phonon coupling strength in single wall carbon nanotubes |
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| Authors: | G L Yu Q L Liang Y L Jia and G Tang |
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| Institution: | (1) Department of Physics, China University of Mining and Technology, 221008, Xuzhou, P.R. China;(2) Department of Physics, Shaoxing College of Arts and Sciences, Shaoxing, 312000, P.R. China;(3) Group of Computational Condensed Matter Physics, National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, 210093, Nanjing, P.R. China |
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| Abstract: | 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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| Keywords: | PACS" target="_blank">PACS 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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