激光与光电子学进展, 2019, 56 (3): 033003, 网络出版: 2019-07-31
一维单壁碳纳米管相干结构振荡的光谱学调制 下载: 963次
Spectroscopic Modulation of Coherent Lattice Vibrations in One-Dimensional Single-Walled Carbon Nanotubes
光谱学 相干声子 抽运-探测 一维碳纳米管 电-声子耦合 spectroscopy coherent phonon pump-probe one-dimensional carbon nanotube electron-phonon coupling
摘要
采用3.7 fs脉冲激光对半导体单壁碳纳米管的两个最低电子跃迁进行选择性抽运,诱导产生了沿碳管径向振荡的低频呼吸模式(RBM)和沿轴向振荡的高频伸缩模式(GM)。通过变换抽运光带宽,探测到最低单激发态抽运和双激发态抽运对两种声子振幅及初始相位的影响。研究结果表明,RBM和GM的振幅以及GM的初始相位得到了明显调制。基于相干电-声子耦合对声子场的影响,调制了碳纳米管晶格结构振荡模式的参量。提供了一种通过激发电子相干运动调控相干晶格振荡特性的可能性。
Abstract
A 3.7 fs pulsed laser is used to selectively pump the two lowest electronic transitions of semiconducting single-walled carbon nanotubes, which induces a low-frequency oscillation radial breathing mode (RBM) and a high-frequency oscillation axis stretching mode (GM) along the carbon tubes. By changing the pump bandwidth, the pump effects of the lowest single-excited-state and dual-excited-state on the amplitudes and initial phases of the two vibrational modes are detected. The research result indicates that the amplitudes of RBM and GM, as well as the initial phase of GM, are obviously modulated. With the influence of coherent electro-phonon coupling on phonon field, the parameters of the vibrational modes of the carbon nanotubes lattice structure are modulated. This provides a possibility to regulate the coherent lattice vibration properties by inducing the electronic coherent motion.
赵欣, 聂兆刚, 张芳腾, 马琳, 郭德强, 赵韦人, 徐华伟, TakayoshiKobayashi. 一维单壁碳纳米管相干结构振荡的光谱学调制[J]. 激光与光电子学进展, 2019, 56(3): 033003. Xin Zhao, Zhaogang Nie, Fangteng Zhang, Lin Ma, Deqiang Guo, Weiren Zhao, Huawei Xu, Kobayashi Takayoshi. Spectroscopic Modulation of Coherent Lattice Vibrations in One-Dimensional Single-Walled Carbon Nanotubes[J]. Laser & Optoelectronics Progress, 2019, 56(3): 033003.