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Phys. Rev. Lett. 102, 037402 (2009) [4 pages]

Chirality-Selective Excitation of Coherent Phonons in Carbon Nanotubes by Femtosecond Optical Pulses

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J.-H. Kim1, K.-J. Han1, N.-J. Kim1, K.-J. Yee1,*, Y.-S. Lim2, G. D. Sanders3, C. J. Stanton3, L. G. Booshehri4, E. H. Hároz4, and J. Kono4,†
1Department of Physics, Chungnam National University, Daejeon, 305-764, Republic of Korea
2Department of Applied Physics, Konkuk University, Chungju, Chungbuk, 380-701, Republic of Korea
3Department of Physics, University of Florida, Gainesville, Florida 32611, USA
4Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, USA

Received 15 May 2008; published 23 January 2009

Using predesigned trains of femtosecond optical pulses, we have selectively excited coherent phonons of the radial breathing mode of specific-chirality single-walled carbon nanotubes within an ensemble sample. By analyzing the initial phase of the phonon oscillations, we prove that the tube diameter initially increases in response to ultrafast photoexcitation. Furthermore, from excitation profiles, we demonstrate that an excitonic absorption peak of carbon nanotubes periodically oscillates as a function of time when the tube diameter undergoes coherent radial breathing mode oscillations.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.037402
DOI:
10.1103/PhysRevLett.102.037402
PACS:
78.67.Ch, 61.48.De, 63.22.Gh, 81.07.De

*Corresponding author.

kyee@cnu.ac.kr

†Corresponding author.

kono@rice.edu

 
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