Ultrafast Spectroscopy of Excitons in Single-Walled Carbon Nanotubes

O. J. Korovyanko, C.-X. Sheng, Z. V. Vardeny, A. B. Dalton, and R. H. Baughman
Phys. Rev. Lett. 92, 017403 – Published 9 January 2004

Abstract

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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  • Received 29 July 2003

DOI:https://doi.org/10.1103/PhysRevLett.92.017403

©2004 American Physical Society

Authors & Affiliations

O. J. Korovyanko1, C.-X. Sheng1, Z. V. Vardeny1, A. B. Dalton2, and R. H. Baughman2

  • 1Department of Physics, University of Utah, Salt Lake City, Utah 84112, USA
  • 2Nano Tech Institute, University of Texas at Dallas, Richardson, Texas 75083, USA

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Vol. 92, Iss. 1 — 9 January 2004

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