Probing superfluid $^4\mathrm{He}$ with high-frequency nanomechanical resonators down to $\mathrm{mK}$ temperatures
Abstract
Superfluids, such as superfluid and , exhibit a broad range of quantum phenomena and excitations which are unique to these systems. Nanoscale mechanical resonators are sensitive and versatile force detectors with the ability to operate over many orders of magnitude in damping. Using nanomechanical-doubly clamped beams of extremely high quality factors (), we probe superfluid from the superfluid transition temperature down to temperatures at frequencies up to . Our studies show that nanobeam damping is dominated by hydrodynamic viscosity of the normal component of above . In the temperature range , the ballistic quasiparticles (phonons and rotons) determine the beams' behavior. At lower temperatures, damping saturates and is determined either by magnetomotive losses or acoustic emission into helium. It is remarkable that all these distinct regimes can be extracted with just a single device, despite damping changing over six orders of magnitude.
Cite
@article{arxiv.1907.00970,
title = {Probing superfluid $^4\mathrm{He}$ with high-frequency nanomechanical resonators down to $\mathrm{mK}$ temperatures},
author = {A. M. Guenault and A. Guthrie and R. P. Haley and S. Kafanov and Yu. A. Pashkin and G. R. Pickett and M. Poole and R. Schanen and V. Tsepelin and D. E. Zmeev and E. Collin and O. Maillet and R. Gazizulin},
journal= {arXiv preprint arXiv:1907.00970},
year = {2019}
}
Comments
4 pages, 2 figures. arXiv admin note: text overlap with arXiv:1810.10129