Nanotube-Based NEMS: Control vs. Thermodynamic Fluctuations

Details Nanotube-Based NEMS: Control vs. Thermodynamic Fluctuations Nanotube-Based NEMS: Control vs. Thermodynamic Fluctuations

2010-04-29

arxiv.org/abs/1004.5282v1

Phys. Rev. B 81, 155453 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

40 pages, 12 figures

Scientific paper

10.1103/PhysRevB.81.155453

Multi-scale simulations of nanotube-based nanoelectromechanical systems (NEMS) controlled by a nonuniform electric field are performed by an example of a gigahertz oscillator. Using molecular dynamics simulations, we obtain the friction coefficients and characteristics of the thermal noise associated with the relative motion of the nanotube walls. These results are used in a phenomenological one-dimensional oscillator model. The analysis based both on this model and the Fokker-Planck equation for the oscillation energy distribution function shows how thermodynamic fluctuations restrict the possibility of controlling NEMS operation for systems of small sizes. The parameters of the force for which control of the oscillator operation is possible are determined.

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