Detecting a phonon flux in superfluid 4He by a nanomechanical resonator

The dataset for the paper: "Detecting a phonon flux in superfluid 4He by a nanomechanical resonator", accepted to Physical Review B as a Rapid communication. Abstract: 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.

本数据集对应的论文为《通过纳米机械谐振器探测超流氦-4中的声子流（Detecting a phonon flux in superfluid ⁴He by a nanomechanical resonator）》，该论文已被《物理评论B辑（Physical Review B）》接收为快速通讯（Rapid communication）。
摘要：纳米机械谐振器（nanomechanical resonator）已被广泛用作高灵敏度力探测器。本文证实，浸没于超流氦-4中的高品质因数（high quality factor）谐振器可通过调制声子流实现激发。置于超流氦-4中的纳米加热器可作为液态中弹道声子的源，即所谓“声子风”。当声子流的调制频率与机械谐振器的共振频率相匹配时，即可激发谐振器的运动。该弹道热机械效应有望为量子流体领域开辟全新的实验方向。