Journal
PHYSICAL REVIEW B
Volume 91, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.024503
Keywords
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Funding
- University of Alberta, Faculty of Science
- Natural Sciences and Engineering Research Council, Canada
- Canada Foundation for Innovation
- Alberta Innovates Technology Futures
- Alfred P. Sloan Foundation
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We have developed a nanomechanical resonator, for which the motional degree of freedom is a superfluid He-4 oscillating flow confined to precisely defined nanofluidic channels. It is composed of an in-cavity capacitor measuring the dielectric constant, which is coupled to a superfluid Helmholtz resonance within nanoscale channels, and it enables sensitive detection of nanofluidic quantum flow. We present a model to interpret the dynamics of our superfluid nanomechanical resonator, and we show how it can be used for probing confined geometry effects on thermodynamic functions. We report isobaric measurements of the superfluid fraction in liquid He-4 at various pressures, and the onset of quantum turbulence in restricted geometry.
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