Eur. Phys. J. B 70, 469-473 (2009)
https://doi.org/10.1140/epjb/e2009-00259-3

Exciton-phonon coupling strength in single wall carbon nanotubes

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

Corresponding author: ^a yuguili@gmail.com

Received: 27 November 2008
Revised: 19 May 2009
Published online: 21 July 2009

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)].