Fluctuation broadening in carbon nanotube resonators

We simulated the behavior of suspended carbon nanotube resonators over a broad range of temperatures to explore the physics of semiflexible polymers in underdamped environments. We find that thermal fluctuations induce strong coupling between resonance modes. This effect leads to spectral fluctuatio...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2012-11, Vol.109 (47), p.19093-19096
Main Authors: Barnard, Arthur W, Sazonova, Vera, van der Zande, Arend M, McEuen, Paul L
Format: Article
Language:English
Subjects:
Bending
Carbon
Carbon nanotubes
Frequency shift
Line spectra
Nanotubes
Physical Sciences
Physics
Polymers
Q factors
Resonators
Simulation
Spectral energy distribution
Temperature
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Summary:We simulated the behavior of suspended carbon nanotube resonators over a broad range of temperatures to explore the physics of semiflexible polymers in underdamped environments. We find that thermal fluctuations induce strong coupling between resonance modes. This effect leads to spectral fluctuations that readily account for the experimentally observed quality factors Q ∼ 100 at 300 K . Using a mean-field approach to describe fluctuations, we analytically calculate Q and frequency shifts in tensioned and buckled carbon nanotubes and find excellent agreement with simulations.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.1216407109