High-energy phonon branches of an individual metallic carbon nanotube
High-energy phonon branches of an individual metallic carbon nanotube
复制标题
DOI：
10.1103/physrevlett.91.087402
复制
发表时间：
2003-08-22
影响因子：
8.6
通讯作者：
Thomsen, C
中科院分区：
文献类型：
--
作者：
Maultzsch, J;Reich, S;Thomsen, C
我们目前的激发能依赖于拉曼测量2.05和2.41 eV之间的同一个单独的碳纳米管。我们发现D模（63 cm（-1）/eV）和高能模的拉曼频率都发生了变化。在1600 cm（-1）附近观测到的模的频率随激光能量的变化关系，映射出了布里渊区伽玛点附近金属管的声子色散关系。我们的研究结果证明了单壁碳纳米管的整个一阶拉曼光谱都是由双共振散射产生的。此外，我们证实了实验中的声子软化金属管的Peierls类机制。
We present excitation-energy dependent Raman measurements between 2.05 and 2.41 eV on the same individual carbon nanotube. We find a change in the Raman frequencies of both the D mode (63 cm(-1)/eV) and the high-energy modes. The observed frequencies of the modes at approximate to1600 cm(-1) as a function of laser-energy map the phonon dispersion relation of a metallic tube near the Gamma point of the Brillouin zone. Our results prove the entire first-order Raman spectrum in single-wall carbon nanotubes to originate from double-resonant scattering. Moreover, we confirm experimentally the phonon softening in metallic tubes by a Peierls-like mechanism.