Nanoscale mechanical resonators are widely utilized to provide high sensitivity force detectors. Here we demonstrate that such high quality factor resonators immersed in superfluid (^4He) can be excited by a modulated flux of phonons. A nanosized heater immersed in superfluid (^4He) acts as a source of ballistic phonons in the liquid – "phonon wind". When the modulation frequency of the phonon flux matches the resonance frequency of the mechanical resonator, the motion of the latter can be excited. This ballistic thermomechanical effect can potentially open up new types of experiments in quantum fluids.

中文翻译：

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用纳米机械共振器检测超流体4He中的声子通量

纳米级机械谐振器被广泛用于提供高灵敏度力检测器。在这里，我们证明了浸入超流体（^ 4He）中的这种高质量因子谐振器可以通过声子的调制通量来激发。浸入超流体（^ 4He）中的纳米级加热器充当液体中弹道声子的来源，即“声子风”。当声子通量的调制频率与机械谐振器的谐振频率匹配时，可以激发后者的运动。这种弹道热机械效应可能会在量子流体中开辟新类型的实验。