Tuning nonlinear damping in graphene nanoresonators by parametric-direct internal resonance.
Tuning nonlinear damping in graphene nanoresonators by parametric-direct internal resonance.
复制标题
利用参数直接内共振调谐石墨烯纳米谐振器的非线性阻尼。
DOI：
10.1038/s41467-021-21334-w
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发表时间：
2021-02-17
影响因子：
16.6
通讯作者：
Alijani F
中科院分区：
文献类型：
--
作者：
Keşkekler A;Shoshani O;Lee M;van der Zant HSJ;Steeneken PG;Alijani F
非线性阻尼的机械来源在现代物理学中起着核心作用，从固态物理学到热力学。机械耗散的微观理论表明，当共振模式的非线性阻尼与接近其共振频率的两倍的振动模式耦合时，它可以被强烈增强。到目前为止，还没有这种增强的实验证据。在本文中，我们通过实验证明，纳米谐振器驱动成参数直接内共振为非线性耗散的微观理论提供了支持证据。通过调节驱动电平，我们在40-70 MHz范围内调整石墨烯纳米鼓的参数共振，以达到连续的2对1内部共振，导致非线性阻尼增加近两倍。我们的研究开辟了一条利用模态相互作用和参数共振来实现宽频率范围工程非线性耗散谐振器的途径。非线性耗散是纳米谐振器中常见的现象，但其微观起源尚不清楚。在这里，非线性阻尼被发现在接近内部共振条件的石墨烯纳米鼓中得到增强，提供了基于这种现象的机制的见解。
Mechanical sources of nonlinear damping play a central role in modern physics, from solid-state physics to thermodynamics. The microscopic theory of mechanical dissipation suggests that nonlinear damping of a resonant mode can be strongly enhanced when it is coupled to a vibration mode that is close to twice its resonance frequency. To date, no experimental evidence of this enhancement has been realized. In this letter, we experimentally show that nanoresonators driven into parametric-direct internal resonance provide supporting evidence for the microscopic theory of nonlinear dissipation. By regulating the drive level, we tune the parametric resonance of a graphene nanodrum over a range of 40–70 MHz to reach successive two-to-one internal resonances, leading to a nearly two-fold increase of the nonlinear damping. Our study opens up a route towards utilizing modal interactions and parametric resonance to realize resonators with engineered nonlinear dissipation over wide frequency range. Nonlinear dissipation is frequently observed in nanomechanical resonators, but its microscopic origin remains unclear. Here, nonlinear damping is found to be enhanced in graphene nanodrums close to internal resonance conditions, providing insights on the mechanisms at the basis of this phenomenon.
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