Gigantic Optical Stark Effect and Ultrafast Relaxation of Excitons in Single-Walled Carbon Nanotubes

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  • Maeda Atsushi
    Department of Advanced Materials Science, University of Tokyo
  • Matsumoto Shinji
    Department of Advanced Materials Science, University of Tokyo
  • Kishida Hideo
    Department of Advanced Materials Science, University of Tokyo
  • Takenobu Taishi
    Institute for Materials Research, Tohoku University CREST, Japan Science and Technology Agency
  • Iwasa Yoshihiro
    Institute for Materials Research, Tohoku University CREST, Japan Science and Technology Agency
  • Shimoda Hideo
    Xintek Inc.
  • Zhou Otto
    Department of Physics and Astronomy and Curriculum in Applied and Materials Sciences, University of North Carolina
  • Shiraishi Masashi
    Graduate School of Engineering Science, Osaka University
  • Okamoto Hiroshi
    Department of Advanced Materials Science, University of Tokyo

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Abstract

We report a splitting and a shift of exciton absorptions in semiconducting single-walled carbon nanotubes (SWNTs) by resonant and off-resonant excitation using a fs laser pulse, respectively. This is the first unambiguous observation of the optical Stark effect of excitons in SWNTs, which is responsible for their high optical-switching performance. By scrutinizing transient absorption spectra from the mid- to near-infrared region (0.1–0.8 eV), the ultrafast recovery of real carrier excitations characteristic of bundled structures was attributed to the energy- and charge-transfer processes to metallic SWNTs.

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