Ultrafast Mid-Infrared Intra-Excitonic Response of Individualized Single-Walled Carbon Nanotubes

POSTER

Abstract

We report a femtosecond mid-infrared study of the broadband low-energy response of individualized (6,5) and (7,5) single-walled carbon nanotubes. Strong photoinduced absorption is observed around 200 meV, whose transition energy, oscillator strength, chirality enhancement and dynamics manifest the observation of quasi-1D intra-excitonic transitions. A model of the nanotube 1$s$-2$p$ intra-excitonic cross section yields excellent agreement. Our study further reveals a saturation of the photoinduced absorption with increasing phase-space filling of the correlated $e-h$ pairs.

*the Offce of Science, U.S. DOE via contract DE-AC02-05CH11231, Ames Laboratory, DOE contract DE-AC02- 07CH11358, NSF

Authors

  • Jigang Wang

    • Dept of Physics and Astronomy and Ames Laboratory, Iowa State University
    • Ames Laboratory and Department of Physics and Astronomy, Iowa State University

  • Matt Graham

    • Department of Chemistry, University of California at Berkeley and Physical Biosciences Division, E. O. Lawrence Berkeley National Laboratory

  • Yingzhong Ma

    • Department of Chemistry, University of California at Berkeley and Physical Biosciences Division, E. O. Lawrence Berkeley National Laboratory

  • Graham Fleming

    • Department of Chemistry, University of California at Berkeley and Physical Biosciences Division, E. O. Lawrence Berkeley National Laboratory

  • Robert Kaindl

    • Materials Sciences Division, E.O. Lawrence Berkeley National Laboratory