The Damping of a Micro-electromechanical Resonator in the Presence of Quantum Turbulence in He II*

A micro-electromechanical plate resonator was immersed in ⁴He down to 13 mK at saturated vapor pressure. The resonator consists of a 125x125x2 μm³ plate suspended 2 μm above a substrate. Due to its small mass and and large surface area it is sensitive to vortices in the fluid and vortices pinned to the surface of the device. The device is studied in the presence of fully developed quantum turbulence generated by a quartz tuning fork and in the presence of remnant vortices pinned to the device. Specifically, the velocity dependent damping of the device in these conditions is measured and reported.