Chirality dependence of coherent phonon amplitudes in single-wall carbon nanotubes
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Nugraha-2011-Chirality dependence of coherent phonon amplitudes.pdf
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Author(s)
Dresselhaus, Mildred
Nugraha, Ahmad R. T.
Sanders, G. D.
Sato, K.
Stanton, C. J.
Date Issued
November 2011
Journal
Physical Review B
Publisher
American Physical Society (APS)
Citation
Nugraha, A. et al. “Chirality Dependence of Coherent Phonon Amplitudes in Single-wall Carbon Nanotubes.” Physical Review B 84.17 (2011): n. pag. Web. 2 Mar. 2012. © 2011 American Physical Society
Version
Final published version
Abstract
We simulate the ultrafast dynamics of laser-induced coherent phonons in single-wall carbon nanotubes (SWNTs). In particular, we examine the coherent phonon amplitude of the radial breathing mode (RBM) as a function of excitation energy and chirality. We find that the RBM coherent phonon amplitudes are very sensitive to changes in excitation energy and are strongly chirality dependent. We discuss how the SWNT diameter changes in response to femtosecond laser excitation and under what conditions the diameter of a given SWNT will initially increase or decrease. An effective-mass theory for the electron-phonon interaction gives a physical explanation for these phenomena.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.84.174302
