Capacitive Spring Softening in Single-Walled Carbon Nanotube Nanoelectromechanical Resonators

Details Capacitive Spring Softening in Single-Walled Carbon Nanotube Nanoelectromechanical Resonators Capacitive Spring Softening in Single-Walled Carbon Nanotube Nanoelectromechanical Resonators

2010-10-28

arxiv.org/abs/1010.6099v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages/ 3 figures

Scientific paper

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.

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