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

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Article number060503
<mark>Journal publication date</mark>11/02/2020
<mark>Journal</mark>Physical review B
Issue number6
Number of pages5
Publication StatusPublished
<mark>Original language</mark>English


Nanoscale mechanical resonators are widely utilized to provide high sensitivity force detectors. Here we demonstrate that such high-quality-factor resonators immersed in superfluid He-4 can be excited by a modulated flux of phonons. A nanosized heater immersed in superfluid He-4 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.

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© 2020 American Physical Society