Abstract
AbstractKelvin-waves play an important role for the dissipation of quantum turbulence at low temperatures. Here the plasma resonance of two-dimensional (2D) snowballs trapped below the surface of rotating superfluid 4He are measured for the first time in order to examine whether 2D snowballs could be a new probe for study of vortex dynamics. Below 200 mK, a positive shift of the resonant frequency f1 and linewidth broadening are observed as small variations in the absorption spectra under rotation. Both f1 and the linewidth Δf increase linearly with the rotation speed, and the slopes of f1 and Δf against the rotation speed have no temperature dependence. The increase of Δf suggests that an additional dissipation is caused by the coupling between the snowballs and vortices. We provide a qualitative explanation for the linear increase of Δf in the context of Kelvin-waves excited by the motion of snowballs.
Highlights
The dynamics of quantized vortices in a superfluid is key for the understanding of quantum turbulence
We report preliminary experiments in which we examine whether the transport of two-dimensional (2D) snowballs formed below the surface of rotating superfluid 4He could be a new probe for studying Kelvin-waves
In our previous experiments with electrons formed on the surface of rotating superfluid 4He, we found that the properties of the electrons were seriously affected by the parabolic deformation of the surface of liquid caused by the rotation or by the misalignment of the surface against the rotation axis [16]
Summary
The dynamics of quantized vortices in a superfluid is key for the understanding of quantum turbulence. J Low Temp Phys (2010) 158: 391–396 temperatures where the mutual friction has a negligible effect, Kelvin-waves can be damped only by radiating phonons. Kelvin-waves with a higher wave number of 107 m−1 were generated by the helical motion of ions traveling along a vortex core [5]. In these experiments, the damping of Kelvin-waves was difficult to investigate. We report preliminary experiments in which we examine whether the transport of two-dimensional (2D) snowballs formed below the surface of rotating superfluid 4He could be a new probe for studying Kelvin-waves.
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