Coherent Phonons in Carbon Nanotubes

  • KATO Keiko
    NTT Basic Research Laboratories, Nippon Telegraph and Telephone Corporation
  • KITAJIMA Masahiro
    Department of Applied Physics, School of Applied Science, National Defense Academy of Japan

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  • カーボンナノチューブのコヒーレントフォノン
  • カーボンナノチューブ ノ コヒーレントフォノン

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Abstract

  Carbon nanotubes have potential to make breakthrough achievement in nano-electronics, photonics, and ultrafast devices. We report real-time observations of coherent phonons in aligned single-walled carbon nanotubes through the time-resolved reflectivity measurements with sub-10 fs laser pulses. In the isotropic reflectivity measurements, we observe the radial breathing modes, G and even D modes, while in the anisotropic reflectivity measurements, only the G mode appears. A complex polarization dependence of the G band phonon amplitude in the isotropic reflectivity indicates the superposition of G band phonons with different symmetries.<br>

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