中国物理B ›› 2013, Vol. 22 ›› Issue (7): 77803-077803.doi: 10.1088/1674-1056/22/7/077803

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Photo-induced absorption in pump probe spectroscopy of single-walled carbon nanotubes

朱子鹏   

  1. College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China
  • 收稿日期:2013-01-22 修回日期:2013-02-25 出版日期:2013-06-01 发布日期:2013-06-01
  • 基金资助:
    Project supported by the U.S. National Science Foundation (Grant No. DMR0606505).

Photo-induced absorption in pump probe spectroscopy of single-walled carbon nanotubes

Zhu Zi-Peng (朱子鹏)   

  1. College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China
  • Received:2013-01-22 Revised:2013-02-25 Online:2013-06-01 Published:2013-06-01
  • Contact: Zhu Zi-Peng E-mail:zipeng zhu@yahoo.com
  • Supported by:
    Project supported by the U.S. National Science Foundation (Grant No. DMR0606505).

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摘要： Femtosecond pump probe spectroscopy is employed to study the photo-induced absorption feature in single-walled carbon nanotube transient spectrum. The two advantages of the experiment, a chirality enriched sample and tuning the pump wavelength to the resonance of a specific nanotube species, greatly facilitate the identification of the photo-induced absorption signal of one tube species. It is found that a photo-induced absorption feature is located at one radial breathing mode to the blue side of the E11 state. This finding prompts a new explanation for the origin of the photo-induced absorption: the transition from the ground state to a phonon coupled state near the Eii state. The explanation suggests a superposition mechanism of the photo-bleach and photo-induced absorption signals, which may serve as a key to the interpretation of the complex pump probe transient spectrum of carbon nanotubes. The finding shed some light on the understanding of the complex non-radiative relaxation process and the electronic structure of single-walled carbon nanotubes.

关键词: photo-induced absorption, ultrafast spectroscopy, carbon nanotubes

Abstract: Femtosecond pump probe spectroscopy is employed to study the photo-induced absorption feature in single-walled carbon nanotube transient spectrum. The two advantages of the experiment, a chirality enriched sample and tuning the pump wavelength to the resonance of a specific nanotube species, greatly facilitate the identification of the photo-induced absorption signal of one tube species. It is found that a photo-induced absorption feature is located at one radial breathing mode to the blue side of the E11 state. This finding prompts a new explanation for the origin of the photo-induced absorption: the transition from the ground state to a phonon coupled state near the Eii state. The explanation suggests a superposition mechanism of the photo-bleach and photo-induced absorption signals, which may serve as a key to the interpretation of the complex pump probe transient spectrum of carbon nanotubes. The finding shed some light on the understanding of the complex non-radiative relaxation process and the electronic structure of single-walled carbon nanotubes.

Key words: photo-induced absorption, ultrafast spectroscopy, carbon nanotubes

中图分类号:  (Nanotubes)

  • 78.67.Ch
42.65.-k (Nonlinear optics) 78.47.-p (Spectroscopy of solid state dynamics)