CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Photo-induced absorption in pump probe spectroscopy of single-walled carbon nanotubes |
Zhu Zi-Peng (朱子鹏) |
College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China |
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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.
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Received: 22 January 2013
Revised: 25 February 2013
Accepted manuscript online:
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PACS:
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78.67.Ch
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(Nanotubes)
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42.65.-k
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(Nonlinear optics)
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78.47.-p
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(Spectroscopy of solid state dynamics)
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Fund: Project supported by the U.S. National Science Foundation (Grant No. DMR0606505). |
Corresponding Authors:
Zhu Zi-Peng
E-mail: zipeng zhu@yahoo.com
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Cite this article:
Zhu Zi-Peng (朱子鹏) Photo-induced absorption in pump probe spectroscopy of single-walled carbon nanotubes 2013 Chin. Phys. B 22 077803
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