Thermal self-synchronization of nano-objects
Thermal self-synchronization of nano-objects
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DOI：
10.1063/5.0058252
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发表时间：
2021-08
影响因子：
3.2
通讯作者：
Zhongwei Zhang;Yangyu Guo;M. Bescond;Jie Chen;M. Nomura;S. Volz
中科院分区：
文献类型：
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作者：
Zhongwei Zhang;Yangyu Guo;M. Bescond;Jie Chen;M. Nomura;S. Volz
自同步是自然界中普遍存在的现象，其中振荡器通过相互作用集体锁定频率和相位。虽然自同步需要至少一个振荡器的强制激发，我们证明了这种机制自发出现，由于激活热波动。通过进行分子动力学模拟，我们证明了自同步在一个平台上支持掺杂硅谐振器纳米柱具有不同的本征频率。我们发现，柱子的振动自发地收敛到相同的频率和相位。此外，对固有频率差和耦合强度的依赖性同意与仓本模型的预测。更有趣的是，我们发现声子-声子散射导致的能量耗散和振子之间的势能之间达到平衡，以保持同步。通过增大膜尺寸可以抑制该平衡。虽然微观随机运动是已知的随机概率分布，我们最终证明，他们也可以通过自同步产生相干集体运动。
Self-synchronization is a ubiquitous phenomenon in nature, in which oscillators are collectively locked in frequency and phase through mutual interactions. While self-synchronization requires the forced excitation of at least one of the oscillators, we demonstrate that this mechanism spontaneously appears due to activation from thermal fluctuations. By performing molecular dynamics simulations, we demonstrate self-synchronization in a platform supporting doped silicon resonator nanopillars having different eigenfrequencies. We find that pillar’s vibrations are spontaneously converging to the same frequency and phase. In addition, the dependencies on the intrinsic frequency difference and the coupling strength agree well with the Kuramoto model predictions. More interestingly, we find that a balance between energy dissipation resulting from phonon–phonon scattering and potential energy between oscillators is reached to maintain synchronization. The balance could be suppressed by increasing the membrane size. While microscopic stochastic motions are known to follow random probability distributions, we finally prove that they can also yield coherent collective motions via self-synchronization.