Critical Velocity in the Presence of Surface Bound States in Superfluid ${}^3$He-B

Abstract

A microelectromechanical oscillator with a gap of 1.25 $\mu$m was immersed in superfluid ${}^3$He-B and cooled below 250 $\mu$K at various pressures. Mechanical resonances of its shear motion were measured at various levels of driving force. The oscillator enters into a nonlinear regime above a certain threshold velocity. The damping increases rapidly in the nonlinear region and eventually prevents the velocity of the oscillator from increasing beyond the critical velocity which is much lower than the Landau critical velocity. We propose that this peculiar nonlinear behavior stems from the escape of quasiparticles from the surface bound states into the bulk fluid.

arXiv comment5 pages, 4 figures

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Cited by in corpus (13)

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• Models for supercritical motion in a superfluid Fermi liquid
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• Spin-Current Instability at a Magnetic Domain Wall in a Ferromagnetic Superfluid: a Generation Mechanism of Eccentric Fractional Skyrmions
• New Phases of Superfluid ${}^3$He Confined in Aerogels
• Thermal transport of helium-3 in a strongly confining channel
• Grand Challenges in Quantum Fluids and Solids
• Surface State Dissipation in Confined 3He-A
• NMR-like effect on Anisotropic Magnetic Moment of Surface Bound States in Topological Superfluid ${}^3$He-B
• Dynamics of pinned quantized vortices in superfluid ${}^4$He in a microelectromechanical oscillator
• 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