Coherent phonons in carbon nanotubes and graphene

J. H. Kim, A. R.T. Nugraha, L. G. Booshehri, E. H. Hároz, K. Sato, G. D. Sanders, K. J. Yee, Y. S. Lim, C. J. Stanton, R. Saito, J. Kono

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19 Citations (Scopus)

Abstract

We review recent studies of coherent phonons (CPs) corresponding to the radial breathing mode (RBM) and G-mode in single-wall carbon nanotubes (SWCNTs) and graphene. Because of the bandgap-diameter relationship, RBM-CPs cause bandgap oscillations in SWCNTs, modulating interband transitions at terahertz frequencies. Interband resonances enhance CP signals, allowing for chirality determination. Using pulse shaping, one can selectively excite specific-chirality SWCNTs within an ensemble. G-mode CPs exhibit temperature-dependent dephasing via interaction with RBM phonons. Our microscopic theory derives a driven oscillator equation with a density-dependent driving term, which correctly predicts CP trends within and between (2n + m) families. We also find that the diameter can initially increase or decrease. Finally, we theoretically study the radial breathing like mode in graphene nanoribbons. For excitation near the absorption edge, the driving term is much larger for zigzag nanoribbons. We also explain how the armchair nanoribbon width changes in response to laser excitation.

Original languageEnglish
Pages (from-to)55-80
Number of pages26
JournalChemical Physics
Volume413
DOIs
Publication statusPublished - 2013 Feb 21

Keywords

  • Carbon nanotubes
  • Coherent phonons
  • Graphene
  • Graphene Nanoribbons
  • Ultrafast dynamics

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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    Kim, J. H., Nugraha, A. R. T., Booshehri, L. G., Hároz, E. H., Sato, K., Sanders, G. D., Yee, K. J., Lim, Y. S., Stanton, C. J., Saito, R., & Kono, J. (2013). Coherent phonons in carbon nanotubes and graphene. Chemical Physics, 413, 55-80. https://doi.org/10.1016/j.chemphys.2012.09.017