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Probing superfluid He 4 with high-frequency nanomechanical resonators down to millikelvin temperatures

2019; American Physical Society; Volume: 100; Issue: 2 Linguagem: Inglês

10.1103/physrevb.100.020506

2469-9977

A. M. Guénault, Andrew Guthrie, R. P. Haley, S. Kafanov, Yu. A. Pashkin, G. R. Pickett, M.J. Poole, R. Schanen, V. Tsepelin, D. E. Zmeev, Eddy Collin, Olivier Maillet, R. R. Gazizulin,

Atomic and Subatomic Physics Research

Superfluids, such as superfluid ${}^{3}$He and ${}^{4}$He, exhibit a broad range of quantum phenomena and excitations, which are unique to these systems. Nanoscale mechanical resonators are highly sensitive force detectors with the ability to operate over many orders of magnitude in damping. Using nanomechanical doubly clamped beams, the authors probe superfluid ${}^{4}$He from the superfluid transition temperature down to millikelvin temperatures. They demonstrate excellent agreement with a ballistic model, incorporating thermal quasiparticles with acoustic emission limiting performance at the lowest temperatures.