Graphene nanoelectromechanical resonators and oscillators forex
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DIFFERENCE BETWEEN DISTANCE DISPLACEMENT PHYSICS EXAMPLES
Cite Abstract Made of only one sheet of carbon atoms, graphene is the thinnest yet strongest material ever exist. Since its discovery in , graphene has attracted tremendous research effort worldwide. Guaranteed by the superior electrical and excellent mechanical properties, graphene is the ideal building block for NanoElectroMechanical Systems NEMS. In the first parts of the thesis, I will discuss the fabrications and measurements of typical graphene NEMS resonators, including doubly clamped and fully clamped graphene mechanical resonators.
I have developed a electrical readout technique by using graphene as frequency mixer, demonstrated resonant frequencies in range from 30 to MHz. Such real-time detection improve the measurement speed by 2 orders of magnitude compared to frequency mixing technique, and is critical for practical applications. Finally, I employed active balanced bridge technique in order to reduce overall electrical parasitics, and demonstrated pure capacitive transduction of graphene NEMS resonators.
A simple continuum mechanics model was constructed to understand the frequency tuning behavior, and it agrees with experimental data extremely well. The chemical potential of graphene shifts smoothly within each LL, causing the resonant frequency to change in an explicit pattern. Between LLs, the finite compressibility caused the resonant frequency changing dramatically.
The overall oscillations of resonant frequency with the applied magnetic field could be fitted with only disorder potential as free parameter. Compared with conventional electronic transport technique, such mechanical measurements proven to be a more direct and powerful tool, which we used o study the properties of graphene's ground states in broken symmetry states.
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