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Probing superfluid <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>He</mml:mi><mml:mprescripts /><mml:none /><mml:mn>4</mml:mn></mml:mmultiscripts></mml:math> with high-frequency nanomechanical resonators down to millikelvin temperatures
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 …