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Jpn. J. Appl. Phys. 45 (2006) pp. L513-L515  |Next Article|  |Table of Contents|
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Express Letter

Optical Stark Effect of Exciton in Semiconducting Single-Walled Carbon Nanotubes

Shinji Matsumoto, Hiroyuki Matsui, Atsushi Maeda, Taishi Takenobu^1,2, Yoshihiro Iwasa^1,2, Yasumitsu Miyata^3,4, Hiromichi Kataura⁴, Yutaka Maniwa^2,3 and Hiroshi Okamoto

Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
¹Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
²CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 322-0012, Japan
³Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
⁴Nanotechnology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8562, Japan

(Received April 18, 2006; accepted April 28, 2006; published online May 19, 2006)

An instantaneous blue shift of exciton absorption due to the optical Stark effect was observed in isolated semiconducting single-walled carbon nanotubes (SWNTs) by using a femtosecond (fs) pump-probe spectroscopy. From the analysis of time profiles of transient absorption changes, the photoinduced shift and the dipole moment of the exciton transition were evaluated as ∼1.1 meV for the pump fluence of 34 µJ/cm² and ∼6 eÅ, respectively. Such a large dipole moment as well as ultrafast recovery of real carrier excitations suggests high potential of SWNTs for an ultrafast optical-switching material.

KEYWORDS: carbon nanotube, optical Stark effect, nonlinear optical response, femtosecond spectroscopy, exciton
URL: http://jjap.ipap.jp/link?JJAP/45/L513/
DOI: 10.1143/JJAP.45.L513

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