Ultrafast Spectroscopy of Midinfrared Internal Exciton Transitions in Separated Single-Walled Carbon Nanotubes

Jigang Wang, Matt W. Graham, Yingzhong Ma, Graham R. Fleming, and Robert A. Kaindl
Phys. Rev. Lett. 104, 177401 – Published 26 April 2010

Abstract

We report a femtosecond midinfrared study of the broadband low-energy response of individually separated (6,5) and (7,5) single-walled carbon nanotubes. Strong photoinduced absorption is observed around 200 meV, whose transition energy, oscillator strength, resonant chirality enhancement, and dynamics manifest the observation of quasi-one-dimensional intraexcitonic transitions. A model of the nanotube 1s2p cross section agrees well with the signal amplitudes. Our study further reveals saturation of the photoinduced absorption with increasing phase-space filling of the correlated eh pairs.

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  • Received 2 November 2009

DOI:https://doi.org/10.1103/PhysRevLett.104.177401

©2010 American Physical Society

Authors & Affiliations

Jigang Wang1,2, Matt W. Graham3, Yingzhong Ma3,4, Graham R. Fleming3, and Robert A. Kaindl1

  • 1Materials Sciences Division, E. O. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 2Department of Physics and Astronomy and Ames Laboratory, Iowa State University, Ames, Iowa 50010, USA
  • 3Department of Chemistry, University of California at Berkeley and Physical Biosciences Division, E. O. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 4Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

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Issue

Vol. 104, Iss. 17 — 30 April 2010

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