Phonon Coupling between a Nanomechanical Resonator and a Quantum Fluid
Phonon Coupling between a Nanomechanical Resonator and a Quantum Fluid
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DOI：
10.1021/acs.nanolett.9b00821
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发表时间：
2019-06-01
期刊：
影响因子：
10.8
通讯作者：
Tang, Hong X.
中科院分区：
文献类型：
--
作者：
Fong, King Yan;Jin, Dafei;Tang, Hong X.
纳米力学系统由于其对外力的特殊敏感性，已成为研究介观物理和实现杂化量子系统的重要工具。虽然纳米力学已经在固态系统中得到了广泛的应用，但它在液体中的应用却鲜有人关注。在那里，它发现了独特的应用，如生物传感、流变学传感，以及在未知区域研究经典流体动力学和量子流体动力学。在这项工作中，我们通过接近千兆赫频率的超高频声子(即声波)，展示了纳米光机谐振器与玻色子量子流体--超流体He-4的有效耦合。高的声子交换效率&92%，每个振荡周期的最低激发速率为0.25声子，或相当于k(B)T/Hf(M)Q(M)=0.044
Owing to their extraordinary sensitivity to external forces, nanomechanical systems have become an important tool for studying mesoscopic physics and realizing hybrid quantum systems. While nanomechanics has been widely applied in solid-state systems, its use in liquid receives less attention. There it finds unique applications such as biosensing, rheological sensing, and studying both classical and quantum fluid dynamics in unexplored regimes. In this work, we demonstrate efficient coupling of a nanooptomechanical resonator to a bosonic quantum fluid, superfluid He-4, through ultrahigh-frequency phonons (i.e., sound waves) approaching gigahertz frequencies. A high phonon exchange efficiency >92% and minimum excitation rate of 0.25 phonons per oscillations period, or equivalently k(B)T/hf(m)Q(m) = 0.044