Polarisation dependence of the squash mode in the extreme low frequency vibrational region of single walled carbon nanotubes

There is considerable interest in the vibrational modes of carbon nanotubes as they can be used to determine interaction potentials. In particular, theory predicts the appearance of so called squash modes (SMs, with E2g symmetry representation) at very low frequencies. These SMs are expected to be e...

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Bibliographic Details
Published in:Applied physics letters 2015-05, Vol.106 (20)
Main Authors: Shen, Y., Quirke, N., Zerulla, D.
Format: Article
Language:English
Subjects:
Applied physics
Carbon
Chirality
Dependence
Excitation
Low frequencies
Polarization
Single wall carbon nanotubes
Very Low Frequencies
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Summary:There is considerable interest in the vibrational modes of carbon nanotubes as they can be used to determine interaction potentials. In particular, theory predicts the appearance of so called squash modes (SMs, with E2g symmetry representation) at very low frequencies. These SMs are expected to be extremely sensitive to environmental changes and thus ideal as nanoscale probes. Here, we report clear experimental evidence for the existence of SMs of ordered, dry, single walled carbon nanotube (SWNT) arrays with peaks as close as 18 cm−1 to the laser excitation. Furthermore, we confirm the theoretical predictions regarding the angular and polarisation dependent variations of the SM's intensity with respect to the excitation. Additionally, using both SM and radial breathing mode data, we unambiguously assign the chirality and diameter of the SWNTs in our sample.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4921402