Temperature-Dependent Nonlinear Damping in Palladium Nanomechanical Resonators

被引：12

作者：

Kumar, Shelender ^{[1
]}

Rebari, Shishram ^{[1
]}

Pal, Satyendra Prakash ^{[1
]}

Yadav, Shyam Sundar ^{[1
]}

Kumar, Abhishek ^{[1
]}

Aggarwal, Aaveg ^{[1
]}

Indrajeet, Sagar ^{[1
]}

Venkatesan, Ananth ^{[1
]}

机构：

[1] Indian Inst Sci Educ & Res Mohali, Dept Phys Sci, Manauli 140306, India

来源：

NANO LETTERS | 2021年 / 21卷 / 07期

关键词：

nanoelectromechanical systems; nonlinear dissipation; palladium hydrogen system; Akhiezer damping; two-phonon process; DISSIPATION; SYSTEMS;

D O I：

10.1021/acs.nanolett.1c00109

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Advances in nanofabrication techniques have made it feasible to observe damping phenomena beyond the linear regime in nanomechanical systems. In this work, we report cubic nonlinear damping in palladium nanomechanical resonators. Nanoscale palladium beams exposed to a H-2 atmosphere become softer and display enhanced Duffing nonlinearity as well as nonlinear damping at ultralow temperatures. The damping is highest at the lowest temperatures of similar to 110 mK and decreases when warmed up to similar to 1 K. We experimentally demonstrate for the first time temperature-dependent nonlinear damping in a nano-mechanical system below 1 K. This is consistent with a predicted two-phonon-mediated nonlinear Akhiezer scenario with a ballistic phonon mean free path comparable to the beam thickness. This opens up new possibilities to engineer nonlinear phenomena at low temperatures.

引用

页码：2975 / 2981

页数：7

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