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Journal Article
Fully Suspended Nano-beams for Quantum Fluids
2023
Overview
Non-invasive probes are keystones of fundamental research. Their size and maneuverability (in terms of, for example, speed, dissipated power) define their applicability range for a specific use. As such, solid-state physics possesses, e.g. atomic force microscopy (AFM), scanning tunneling microscopy (STM), or scanning SQUID microscopy. In comparison, quantum fluids (superfluid
3
He,
4
He) are still lacking probes able to sense them (in a fully controllable manner) down to their smallest relevant lengthscales, namely the coherence length
ξ
0
. In this work, we report on the fabrication and cryogenic characterisation of fully suspended (hanging over an open window, with no substrate underneath)
Si
3
N
4
nano-beams, of width down to 50 nm and quality factor up to
10
5
. As a benchmark experiment we used them to investigate the Knudsen boundary layer of a rarefied gas:
4
He at very low pressures. The absence of the rarefaction effect due to the nearby chip surface discussed in Gazizulin et al. (Phys Rev Lett 120:036802, 2018.
https://doi.org/10.1103/PhysRevLett.120.036802
) is attested, while we report on the effect of the probe size itself.
Publisher
Springer US,Springer Nature B.V,Springer Verlag (Germany)
