Capacitive Spring Softening in Single-Walled Carbon Nanotube Nanoelectromechanical Resonators

Chung Chiang Wu; Zhaohui Zhong

doi:10.1021/nl1039549

Capacitive Spring Softening in Single-Walled Carbon Nanotube Nanoelectromechanical Resonators

Mesoscale and Nanoscale Physics 2015-05-20 v1

Authors: Chung Chiang Wu , Zhaohui Zhong

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Abstract

We report the capacitive spring softening effect observed in single-walled carbon nanotube (SWNT) nanoelectromechanical (NEM) resonators. The nanotube resonators adopt dual-gate configuration with both bottom-gate and side-gate capable of tuning the resonance frequency through capacitive coupling. Interestingly, downward resonance frequency shifting is observed with increasing side-gate voltage, which can be attributed to the capacitive softening of spring constant. Furthermore, in-plane vibrational modes exhibit much stronger spring softening effect than out-of-plan modes. Our dual-gate design should enable the differentiation between these two types of vibrational modes, and open up new possibility for nonlinear operation of nanotube resonators.

Keywords

single-walled carbon nanotubes nanoelectromechanical resonators capacitive spring softening dual-gate configuration resonance frequency tuning vibrational modes

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@article{arxiv.1010.6099,
  title  = {Capacitive Spring Softening in Single-Walled Carbon Nanotube Nanoelectromechanical Resonators},
  author = {Chung Chiang Wu and Zhaohui Zhong},
  journal= {arXiv preprint arXiv:1010.6099},
  year   = {2015}
}

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12 pages/ 3 figures

Capacitive Spring Softening in Single-Walled Carbon Nanotube Nanoelectromechanical Resonators

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