2018/10/23 by A. M. Guénault, Guénault, A. M., Andrew Guthrie +29
Physics and Astronomy · #Atomic and Subatomic Physics Research #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum, superfluid, helium dynamics
paper · pdf · doi:10.48550/arxiv.1810.10129
openalex publication_date 2018/10/23 · openalex created_date 2022/08/02 · openalex updated_date 2026/07/28
We report on nanomechanical resonators with very high-quality factors\noperated as mechanical probes in liquid helium (4\He ), with special\nattention to the superfluid regime down to millikelvin temperatures. Such\nresonators have been used to map out the full range of damping mechanisms in\nthe liquid on the nanometer scale from (10 ,\mK ) up to\n (\∼3 ,\K ). The high sensitivity of these doubly-clamped beams to\nthermal excitations in the superfluid (4\He ) makes it possible to\ndrive them using the momentum transfer from phonons generated by a nearby\nheater. This so-called "\phonon wind" is an inverse thermomechanical\neffect that until now has never been demonstrated, and provides the possibility\nto perform a new type of optomechanical experiments in quantum fluids.\n