Deviation from the Normal Mode Expansion in a Coupled Graphene-Nanomechanical System
Deviation from the Normal Mode Expansion in a Coupled Graphene-Nanomechanical System
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DOI：
10.1103/physrevapplied.6.064021
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发表时间：
2016-12-29
影响因子：
4.6
通讯作者：
Arcizet, Olivier
中科院分区：
文献类型：
--
作者：
Schwarz, Cornelia;Pigeau, Benjamin;Arcizet, Olivier
在光机械测量的悬浮在氮化硅纳米谐振器上的石墨烯膜的热噪声中观察到与正常模式展开的显着偏差。这种偏差是由于耦合本征模空间范围内的机械耗散的异质特征造成的，该特征是通过避免反交叉来调整的。我们证明了涨落耗散定理可以正确评估耦合纳米机械系统的热噪声。由于在纳米尺度上很难确保良好的空间均匀性，因此这种方法对于正确描述最终影响其传感能力的纳米机械系统的热噪声至关重要。
A significant deviation from the normal mode expansion is observed in the optomechanically measured thermal noise of a graphene membrane suspended on a silicon nitride nanoresonator. This deviation is due to the heterogeneous character of mechanical dissipation over the spatial extent of coupled eigenmodes, which is tuned through an avoided anticrossing. We demonstrate that the fluctuation-dissipation theorem permits a proper evaluation of the thermal noise of the coupled nanomechanical system. Since a good spatial homogeneity is delicate to ensure at the nanoscale, this approach is fundamental to correctly describing the thermal noise of nanomechanical systems which ultimately impact their sensing capacity.