Detecting the "phonon wind" in superfluid ${}^4\mathrm{He}$ by a nanomechanical resonator

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 \(^4\mathrm{He}\) can be excited by a modulated flux of phonons. A nanosized heater immersed in superfluid \(^4\mathrm{He}\) 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.

arXiv comment4 pages, 3 figures. arXiv admin note: substantial text overlap with arXiv:1810.10129

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Cited by in corpus (6)

• Mesoscopic physics of nanomechanical systems
• The dispersion relation of Landau elementary excitations and the thermodynamic properties of superfluid ${}^4$He
• Nanoscale Real-Time Detection of Quantum Vortices at Millikelvin Temperatures
• Fundamental dissipation due to bound fermions in the zero-temperature limit
• Dimensional control of tunneling two level systems in nanoelectromechanical resonators
• Fully suspended nano-beams for quantum fluids