Entropic Spectral Broadening in Carbon Nanotube Resonators

Arthur W. Barnard; Vera Sazonova; Arend M. van der Zande; Paul L. McEuen

doi:10.1073/pnas.1216407109

Entropic Spectral Broadening in Carbon Nanotube Resonators

Mesoscale and Nanoscale Physics 2015-05-30 v1 Computational Physics

Authors: Arthur W. Barnard , Vera Sazonova , Arend M. van der Zande , Paul L. McEuen

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Abstract

We simulated the behavior of suspended carbon-nanotube (CNT) resonators over a broad range of temperatures to address the unexplained spectral broadening and frequency shifts seen in experiments. We find that thermal fluctuations induce strong coupling between resonance modes. This effect leads to spectral fluctuations which readily account for the experimentally observed quality factors $Q\sim100$ at $300\ K$ . Using a mean field approach to describe entropic fluctuations we analytically calculate $Q$ and frequency shifts in tensioned and buckled CNTs and find excellent agreement with simulations.

Keywords

carbon nanotube resonators spectral broadening thermal fluctuations mode coupling quality factor entropic fluctuations mean field theory

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@article{arxiv.1110.1517,
  title  = {Entropic Spectral Broadening in Carbon Nanotube Resonators},
  author = {Arthur W. Barnard and Vera Sazonova and Arend M. van der Zande and Paul L. McEuen},
  journal= {arXiv preprint arXiv:1110.1517},
  year   = {2015}
}

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5 pages, 4 figures

Entropic Spectral Broadening in Carbon Nanotube Resonators

Abstract

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