Ultrafast spectroscopy of excitons in single-walled carbon nanotubes

被引：182

作者：

Korovyanko, OJ ^{[1
]}

Sheng, CX

Vardeny, ZV

Dalton, AB

Baughman, RH

机构：

[1] Univ Utah, Dept Phys, Salt Lake City, UT 84112 USA

[2] Univ Texas, Nano Tech Inst, Richardson, TX 75083 USA

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.92.017403

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

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