Mechanical dissipation in MoRe superconducting metal drums
S. Yanai (TU Delft - QN/Steele Lab)
V Singh (TU Delft - QN/Mol. Electronics & Devices)
M. Yuan (TU Delft - QN/Steele Lab)
Mario F. Gely (TU Delft - QN/Steele Lab)
S.J. Bosman (TU Delft - QN/Steele Lab)
G. A. Steele (TU Delft - QN/Steele Lab)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
We experimentally investigate dissipation in mechanical resonators made of a disordered superconducting thin film of a Molybdenum-Rhenium(MoRe) alloy. Electrostatically driving the drum with a resonant AC voltage, we detect its motion using a superconducting microwave cavity. From the temperature dependence of mechanical resonance frequencies and quality factors, we find evidence for non-resonant, mechanically active two-level systems (TLSs) limiting its quality factor at low temperature. In addition, we observe a strong suppression of mechanical dissipation at large mechanical driving amplitudes, suggesting an unconventional saturation of the non-resonant TLSs. These observations shed light on the mechanism of mechanical damping in superconducting drums and routes towards understanding dissipation in such devices.
help_outline