Anomalous Damping of a Micro-electro-mechanical Oscillator in Superfluid ${}^3$He-B

Abstract

The mechanical resonance properties of a micro-electro-mechanical oscillator with a gap of 1.25 $\mu$m was studied in superfluid ${}^3$He-B at various pressures. The oscillator was driven in the linear damping regime where the damping coefficient is independent of the oscillator velocity. The quality factor of the oscillator remains low ($Q\approx 80$) down to 0.1 $T_c$, 4 orders of magnitude less than the intrinsic quality factor measured in vacuum at 4 K. In addition to the Boltzmann temperature dependent contribution to the damping, a damping proportional to temperature was found to dominate at low temperatures. We propose a multiple scattering mechanism of the surface Andreev bound states to be a possible cause for the anomalous damping.

arXiv comment5 pages, 5 figures

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• Andreev Bound States in Superconducting Films and Confined Superfluid He-3
• Nanomechanical resonators for cryogenic research
• Review: Observation of Majorana Bound States at a Free Surface of ${}^3$He-B
• Magnon Bose-Einstein condensates: from time crystals and quantum chromodynamics to vortex sensing and cosmology
• Damping of a micro-electromechanical oscillator in turbulent superfluid ${}^4$He: A novel probe of quantized vorticity in the ultra-low temperature regime
• New Phases of Superfluid ${}^3$He Confined in Aerogels
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• Grand Challenges in Quantum Fluids and Solids
• Transport of bound quasiparticle states in a two-dimensional boundary superfluid
• Strong-coupling corrections to hard domain walls in superfluid 3He-B
• Superfluid ${}^4$He as a rigorous test bench for different damping models in nanoelectromechanical resonators
• NMR-like effect on Anisotropic Magnetic Moment of Surface Bound States in Topological Superfluid ${}^3$He-B
• Subgap in the surface bound states spectrum of Superfluid ${}^3$He-B with Rough Surface
• Superfluid ${}^3$He-B Surface States in a Confined Geometry Probed by a Microelectromechanical Oscillator