Abstract
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 \(\xi _{0}\). In this work, we report on the fabrication and cryogenic characterisation of fully suspended (hanging over an open window, with no substrate underneath) \({\text {Si}}_{3} {\text {N}}_{4}\) 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.
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Acknowledgements
We acknowledge the use of the Néel Nanofab facility, and fruitful discussions with Rasul Gazizulin, Benjamin Pigeau and Jean-Philippe Poizat. The authors acknowledge the support from ERC StG Grant UNIGLASS No. 714692, and ERC CoG grant ULT-NEMS No. 647917. The research leading to these results has received funding from the European Union’s Horizon 2020 Research and Innovation Programme, under Grant Agreement No. 824109, the European Microkelvin Platform (EMP).
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Golokolenov, I., Alperin, B., Fernandez, B. et al. Fully Suspended Nano-beams for Quantum Fluids. J Low Temp Phys 210, 550–561 (2023). https://doi.org/10.1007/s10909-022-02722-y
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DOI: https://doi.org/10.1007/s10909-022-02722-y