Superfluid ${}^4$He as a rigorous test bench for different damping models in nanoelectromechanical resonators

Timo Kamppinen, Jere T. Mäkinen, Vladimir B. Eltsov

We have used nanoelectromechanical resonators to probe superfluid ${}^4$He at different temperature regimes, spanning over four orders of magnitude in damping. These regimes are char…