Dissipation and fluctuations in nanoelectromechanical systems based on carbon nanotubes - Condensed Matter > Mesoscale and Nanoscale PhysicsReport as inadecuate




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Abstract: Tribological characteristics of nanotube-based nanoelectromechanical systemsNEMS exemplified by a gigahertz oscillator are studied. Various factors thatinfluence the tribological properties of the nanotube-based NEMS arequantitatively analyzed with the use of molecular dynamics calculations of thequality factor Q-factor of the gigahertz oscillator. We demonstrate thatcommensurability of the nanotube walls can increase the dissipation rate, whilethe structure of the wall ends and the nanotube length do not influence theQ-factor. It is shown that the dissipation rate depends on the interwalldistance and the way of fixation of the outer wall and is significant in thecase of a poor fixation for the nanotubes with a large interwall distance.Defects are found to strongly decrease the Q-factor due to the excitation oflow-frequency vibrational modes. No universal correlation between the staticfriction forces and the energy dissipation rate is established. We propose anexplanation of the obtained results on the basis of the classical theory ofvibrational-translational relaxation. Significant thermodynamics fluctuationsare revealed in the gigahertz oscillator by molecular dynamics simulations andanalyzed in the framework of the fluctuation-dissipation theorem. Possibilityof designing the NEMS with a desirable Q-factor and their applications arediscussed on the basis of the above results.



Author: I. V. Lebedeva, A. A. Knizhnik, A. M. Popov, Yu. E. Lozovik, B. V. Potapkin

Source: https://arxiv.org/







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