Operating Nanobeams in a Quantum Fluid.

Autor: Bradley DI; Department of Physics, Lancaster University, Lancaster, LA1 4YB, United Kingdom., George R; Department of Physics, Lancaster University, Lancaster, LA1 4YB, United Kingdom., Guénault AM; Department of Physics, Lancaster University, Lancaster, LA1 4YB, United Kingdom., Haley RP; Department of Physics, Lancaster University, Lancaster, LA1 4YB, United Kingdom., Kafanov S; Department of Physics, Lancaster University, Lancaster, LA1 4YB, United Kingdom. sergey.kafanov@lancaster.ac.uk., Noble MT; Department of Physics, Lancaster University, Lancaster, LA1 4YB, United Kingdom., Pashkin YA; Department of Physics, Lancaster University, Lancaster, LA1 4YB, United Kingdom., Pickett GR; Department of Physics, Lancaster University, Lancaster, LA1 4YB, United Kingdom., Poole M; Department of Physics, Lancaster University, Lancaster, LA1 4YB, United Kingdom., Prance JR; Department of Physics, Lancaster University, Lancaster, LA1 4YB, United Kingdom., Sarsby M; Department of Physics, Lancaster University, Lancaster, LA1 4YB, United Kingdom., Schanen R; Department of Physics, Lancaster University, Lancaster, LA1 4YB, United Kingdom., Tsepelin V; Department of Physics, Lancaster University, Lancaster, LA1 4YB, United Kingdom. v.tsepelin@lancaster.ac.uk., Wilcox T; Department of Physics, Lancaster University, Lancaster, LA1 4YB, United Kingdom., Zmeev DE; Department of Physics, Lancaster University, Lancaster, LA1 4YB, United Kingdom.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2017 Jul 07; Vol. 7 (1), pp. 4876. Date of Electronic Publication: 2017 Jul 07.
DOI: 10.1038/s41598-017-04842-y
Abstrakt: Microelectromechanical (MEMS) and nanoelectromechanical systems (NEMS) are ideal candidates for exploring quantum fluids, since they can be manufactured reproducibly, cover the frequency range from hundreds of kilohertz up to gigahertz and usually have very low power dissipation. Their small size offers the possibility of probing the superfluid on scales comparable to, and below, the coherence length. That said, there have been hitherto no successful measurements of NEMS resonators in the liquid phases of helium. Here we report the operation of doubly-clamped aluminium nanobeams in superfluid 4 He at temperatures spanning the superfluid transition. The devices are shown to be very sensitive detectors of the superfluid density and the normal fluid damping. However, a further and very important outcome of this work is the knowledge that now we have demonstrated that these devices can be successfully operated in superfluid 4 He, it is straightforward to apply them in superfluid 3 He which can be routinely cooled to below 100 μK. This brings us into the regime where nanomechanical devices operating at a few MHz frequencies may enter their mechanical quantum ground state.
Databáze: MEDLINE
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