Coherent lattice vibrations in single-walled carbon nanotubes
Coherent lattice vibrations in single-walled carbon nanotubes
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DOI：
10.1021/nl061599p
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发表时间：
2006-12-13
期刊：
影响因子：
10.8
通讯作者：
Smalley, Richard E.
中科院分区：
文献类型：
--
作者：
Lim, Yong-Sik;Yee, Ki-Ju;Smalley, Richard E.
利用超短激光脉冲在单壁碳纳米管中产生并探测了对应于径向呼吸模式（RBM）的相干晶格振动。因为带隙是直径的函数，所以这些RBM引起的直径振荡引起超快带隙振荡，从而调制声子频率（3-9 THz）处的带间激子共振。激发光谱显示出大量的明显的峰，允许确定特定样品中存在的手性和样品之间特定手性的相对群体差异。
We have generated and detected coherent lattice vibrations in single-walled carbon nanotubes corresponding to the radial breathing mode (RBM) using ultrashort laser pulses. Because the band gap is a function of diameter, these RBM-induced diameter oscillations cause ultrafast band gap oscillations, thereby modulating the interband excitonic resonances at the phonon frequencies (3-9 THz). Excitation spectra show a large number of pronounced peaks, allowing the determination of the chiralities present in particular samples and relative population differences of particular chiralities between samples.