Detecting a phonon flux in superfluid He 4 by a nanomechanical resonator
2020; American Physical Society; Volume: 101; Issue: 6 Linguagem: Inglês
10.1103/physrevb.101.060503
ISSN2469-9977
AutoresA. M. Guénault, Andrew Guthrie, R. P. Haley, S. Kafanov, Yu. A. Pashkin, G. R. Pickett, V. Tsepelin, D. E. Zmeev, Eddy Collin, R. R. Gazizulin, Olivier Maillet,
Tópico(s)Quantum, superfluid, helium dynamics
ResumoNanomechanical resonators are extremely sensitive force detectors and, therefore, provide fantastic probes for superfluids at low temperatures. The authors show that a nanomechanical resonator can detect the modulated flux of thermal phonons (`phonon wind') in superfluid ${}^{4}$He at millikelvin temperatures. To do this, they set up a modulated flux of phonons by passing an ac current through a nearby heater. The phonons collide with the nanobeam and are able to excite the system into oscillation.
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