Ultrafast spectroscopy of excitons in single-walled carbon nanotubes
Ultrafast spectroscopy of excitons in single-walled carbon nanotubes
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DOI：
10.1103/physrevlett.92.017403
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发表时间：
2004-01-09
影响因子：
8.6
通讯作者：
Baughman, RH
中科院分区：
文献类型：
--
作者：
Korovyanko, OJ;Sheng, CX;Baughman, RH
我们用不同的泵浦探测波长和强度研究了含半导体和金属单壁碳纳米管(SWNTs)的薄膜中光激发的飞秒动力学。我们发现在半导体和金属单壁碳纳米管中，具有亚皮秒动力学的受限激子和电荷载流子分别主导着超快响应。令人惊讶的是，我们还从半导体纳米管的激子激发态吸收带和多光子吸收共振中发现了子带之间的跃迁；这揭示了电子-电子相互作用在单壁碳纳米管光学中的重要作用。
We studied the femtosecond dynamics of photoexcitations in films containing semiconducting and metallic single-walled carbon nanotubes (SWNTs), using various pump-probe wavelengths and intensities. We found that confined excitons and charge carriers with subpicosecond dynamics dominate the ultrafast response in semiconducting and metallic SWNTs, respectively. Surprisingly, we also found from the exciton excited state absorption bands and multiphoton absorption resonances in the semiconducting nanotubes that transitions between subbands are allowed; this unravels the important role of electron-electron interaction in SWNT optics.