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arXiv 2009.08324cond-mat.mes-hallnlin.CD
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钯纳米机械谐振器的温度非线性阻尼

Temperature Dependent Non-linear Damping in Palladium Nano-mechanical Resonators

Shelender Kumar, S. Rebari, Satyendra P. Pal, S. S. Yadav, Abhishek Kumar, § A. Aggarwal, S. Indrajeet, A. Venkatesan

摘要:

纳米制造技术的进步使得在纳米机械系统中观察线性范围之外的阻尼现象成为可能。在这项工作中,我们报告了钯纳米机械谐振器的立方非线性阻尼。纳米尺度的钯梁暴露于$H_2$气氛变得更软,并显示增强的Duffing非线性以及在超低温下的非线性阻尼。在$\sim 110\: mK$的最低温度下阻尼最高,当升温至$\sim 1\textrm{ }K$时阻尼降低。我们首次在实验上证明了在低于1K的纳米机械系统中存在温度依赖的非线性阻尼。这是一致的预测两个声子介导的非线性Akhiezer方案弹道声子的平均自由程可比的光束厚度。这为在低温下设计非线性现象开辟了新的可能性。

英文摘要:

Advances in nano-fabrication techniques has made it feasible to observe damping phenomena beyond the linear regime in nano-mechanical systems. In this work, we report cubic non-linear damping in palladium nano-mechanical resonators. Nano-scale palladium beams exposed to a $H_2$ atmosphere become softer and display enhanced Duffing non-linearity as well as non-linear damping at ultra low temperatures. The damping is highest at the lowest temperatures of $\sim 110\: mK$ and decreases when warmed up-to $\sim 1\textrm{ }K$. We experimentally demonstrate for the first time a temperature dependent non-linear damping in a nano-mechanical system below 1 K. It is consistent with a predicted two phonon mediated non-linear Akhiezer scenario for ballistic phonons with mean free path comparable to the beam thickness. This opens up new possibilities to engineer non-linear phenomena at low temperatures.

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