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Phonon dephasing and population decay dynamics of the G-band of semiconducting single-wall carbon nanotubes

机译：半导体单壁碳纳米管G带的声子相移和种群衰减动力学

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The dephasing and population decay dynamics of optical phonons are studied for semiconducting single-wall carbon nanotubes (SWCNTs) using broadband time-resolved coherent anti-Stokes Raman scattering and time-resolved incoherent anti-Stokes Raman scattering. By simply adjusting the spectral bandwidth of a continuum pulse, we are able to directly measure both the total dephasing time, T_2, and the population decay time, T_1, of the G-band sequentially in the same sample, which allows for one to exclude artifacts due to comparison of dynamics values measured with different sample conditions and different measurement schemes. The values of T_1and T_2/2 are presented for two different SWCNT samples: bundles in a film on glass and a dispersion in water. While the measured T_1 values are similar for the two samples, the pure dephasing times, T_2/2, determined from the T_2/2 and T_1 measurements are faster in bundled SWCNTs than in isolated dispersion. This suggests that neighboring tubes in the film perturbs the vibrational mode more strongly than surrounding surfactants and that the pure dephasing dynamics is more sensitive to the perturbation.
机译：利用宽带时间分辨相干反斯托克斯拉曼散射和时间分辨不相干反斯托克斯拉曼散射研究了半导体单壁碳纳米管（SWCNT）的光子的相移和种群衰减动力学。通过简单地调整连续脉冲的频谱带宽，我们能够直接依次测量同一样本中G波段的总移相时间T_2和总体衰减时间T_1，这使得我们可以排除由于比较了使用不同样品条件和不同测量方案测得的动力学值而导致的伪影。给出了两个不同的SWCNT样品的T_1和T_2 / 2值：玻璃薄膜上的束和在水中的分散液。尽管两个样品的T_1值测量结果相似，但从T_2 / 2和T_1测量值确定的纯脱相时间T_2 / 2在捆绑的SWCNT中比在分离的分散液中更快。这表明膜中的相邻管比周围的表面活性剂更能扰动振动模式，并且纯相移动力学对扰动更敏感。

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