期刊
NANO LETTERS
卷 14, 期 6, 页码 2982-2987出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl403936a
关键词
Nanoelectromechanical systems; graphene; nonlinear dynamics; resonators; parametric oscillators
类别
资金
- UCR CONSEPT Center
- DOE [ER 46940-DE-SC0010597]
- Defense Microelectronics Activity (DMEA) [H94003-10-2-1003]
- [NSF-DMR-1106358]
- [ONR/DMEA-H94003-10-2-1003]
- Direct For Mathematical & Physical Scien [1106358] Funding Source: National Science Foundation
- Division Of Materials Research [1106358] Funding Source: National Science Foundation
We measure the quality factor Q of electrically driven few-layer graphene drumhead resonators, providing an experimental demonstration that Q similar to 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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据