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- W1928329355 abstract "We measure the quality factor Q of electrically driven few-layer graphene drumhead resonators, providing an experimental demonstration that Q ∼ 1/T, where T is the temperature. We develop a model that includes intermodal coupling and tensioned graphene resonators. Because the resonators are atomically thin, out-of-plane fluctuations are large. As a result, Q is mainly determined by stochastic frequency broadening rather than frictional damping, in analogy to nuclear magnetic resonance. This model is in good agreement with experiment. Additionally, at larger drives the resonance line width is enhanced by nonlinear damping, in qualitative agreement with recent theory of damping by radiation of in-plane phonons. Parametric amplification produced by periodic thermal expansion from the ac drive voltage yields an anomalously large line width at the largest drives. Our results contribute toward a general framework for understanding the mechanisms of dissipation and spectral line broadening in atomically thin membrane resonators." @default.
- W1928329355 created "2016-06-24" @default.
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- W1928329355 date "2014-05-08" @default.
- W1928329355 modified "2023-10-16" @default.
- W1928329355 title "Graphene Nanoelectromechanical Systems as Stochastic-Frequency Oscillators" @default.
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- W1928329355 doi "https://doi.org/10.1021/nl403936a" @default.
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