Softening of the Radial Breathing Mode in Metallic Carbon Nanotubes
Name
Farhat-2009-Softening of the Rad.pdf
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Author(s)
Kalbac, Martin
Dresselhaus, Mildred
Sasaki, K.
Kong, Jing
Saito, R.
Hofmann, Mario
Farhat, Hootan
Date Issued
March 2009
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Farhat, H. et al. “Softening of the Radial Breathing Mode in Metallic Carbon Nanotubes.” Physical Review Letters 102.12 (2009): 126804. © 2009 The American Physical Society
Version
Final published version
Abstract
The softening of the radial breathing mode (RBM) of metallic single walled carbon nanotubes (m-SWNTs) due to electron-phonon coupling has been studied by observing the Fermi level (ϵ[subscript F]) dependence of the RBM Raman peak. In situ Raman spectra were obtained from several individual m-SWNTs while varying ϵ[subscript F] electrochemically. The RBM frequency of an intrinsic m-SWNT is shown to be down-shifted relative to highly doped tubes by ~2 cm[subscript -1]. The down-shift is greatest for small diameter and small chiral angle SWNTs. Most tubes show no change in RBM linewidth. A comparison is drawn between the RBM and the G band (ALO phonon) with respect to the ϵ[subscript F] dependence of their frequencies and linewidths.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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
http://dx.doi.org/10.1103/PhysRevLett.102.126804
