Femtosecond spectroscopy of optical excitations in single-walled carbon nanotubes: Evidence for exciton-exciton annihilation
Femtosecond spectroscopy of optical excitations in single-walled carbon nanotubes: Evidence for exciton-exciton annihilation
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DOI：
10.1103/physrevlett.94.157402
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发表时间：
2005-04-22
影响因子：
8.6
通讯作者：
Fleming, GR
中科院分区：
文献类型：
--
作者：
Ma, YZ;Valkunas, L;Fleming, GR
频率分辨飞秒瞬态吸收光谱和动力学测量的光激发的第二和第一电子跃迁的（8，3）单壁碳纳米管物种揭示了这些转变之间的独特的相互响应。基于对光谱、动力学及其对在这些跃迁处观察到的泵浦强度的不同幅度依赖性的分析，我们得出结论，这些观测结果源自光谱的激子起源和非线性激子湮灭。
Frequency-resolved femtosecond transient absorption spectra and kinetics measured by optical excitation of the second and first electronic transitions of the (8,3) single-walled carbon nanotube species reveal a unique mutual response between these transitions. Based on the analysis of the spectra, kinetics, and their distinct amplitude dependence on the pump intensity observed at these transitions, we conclude that these observations originate from both the excitonic origin of the spectrum and nonlinear exciton annihilation.