Wednesday, May 22, 2013

1305.4707 (Yuki Honda et al.)

Coherent monochromatic phonons in highly-purified semiconducting
single-wall carbon nanotubes

Yuki Honda, Elizabeth Maret, Atsushi Hirano, Takeshi Tanaka, Kotaro Makino, Muneaki Hase
We have used a femtosecond pump-probe impulsive Raman technique to explore the polarization dependence of coherent optical phonons in highly-purified and aligned semiconducting single-wall carbon nanotubes (SWCNTs). Coherent phonon spectra for the radial breathing modes (RBMs) exhibit a different monochromatic frequency between the film and solution samples, indicating the presence of differing exciton excitation processes. By varying the polarization of the incident pump beam on the aligned SWCNT film, we found that the anisotropy of the coherent RBM excitation depends on the laser wavelength, which we consider to be associated with the resonant and off-resonant behavior of RBM excitation.
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