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- Title
Probing Bogoliubov Quasiparticles in Superfluid $$^3$$ He with a 'Vibrating-Wire Like' MEMS Device.
- Authors
Defoort, M.; Dufresnes, S.; Ahlstrom, S.; Bradley, D.; Haley, R.; Guénault, A.; Guise, E.; Pickett, G.; Poole, M.; Woods, A.; Tsepelin, V.; Fisher, S.; Godfrin, H.; Collin, E.
- Abstract
We have measured the interaction between superfluid $$^3$$ He-B and a micro-machined goalpost-shaped device at temperatures below $$0.2\,T_\mathrm{c}$$ . The measured damping follows well the theory developed for vibrating wires, in which the Andreev reflection of quasiparticles in the flow field around the moving structure leads to a nonlinear frictional force. At low velocities, the damping force is proportional to velocity, while it tends to saturate for larger excitations. Above a velocity of 2.6 mm s $$^{-1}$$ , the damping abruptly increases, which is interpreted in terms of Cooper-pair breaking. Interestingly, this critical velocity is significantly lower than that reported with other mechanical probes immersed in superfluid $$^3$$ He. Furthermore, we report on a nonlinear resonance shape for large motion amplitudes that we interpret as an inertial effect due to quasiparticle friction, but other mechanisms could possibly be invoked as well.
- Subjects
QUASIPARTICLES; HELIUM at low temperatures; SUPERFLUIDITY; ANDREEV reflection; COOPER pair; FRICTION; MICROELECTROMECHANICAL systems
- Publication
Journal of Low Temperature Physics, 2016, Vol 183, Issue 3/4, p284
- ISSN
0022-2291
- Publication type
Article
- DOI
10.1007/s10909-015-1392-9