“…The frames shown are separated by a time interval 10 ms. The particle consists of 9 glass microspheres bound together with van der Waals interaction 29 , 30 . Its image shape changes during rotation because of laser illumination from one side and is reproducible approximately every 80 ms. Figure 3 Motion of the spinning particle along the surface of He-II recorded at the rate 2000 fps.…”
We report an experimental study of the 2D dynamics of active particles driven by quantum vortices on the free surface of superfluid helium at T = 1.45 К. The particle motion at short times (< 25 ms) relates to anomalous diffusion mode typical for active particles, while for longer times it corresponds to normal diffusion mode. The values of the rotational and translational kinetic energies of the particle allow to determine for the first time the intensity of the particle-vortex interaction and the dissipation rate of the vortex bundle energy. Strong bonding between a particle and a vortex is explained by coupling of normal and superfluid components.
“…The frames shown are separated by a time interval 10 ms. The particle consists of 9 glass microspheres bound together with van der Waals interaction 29 , 30 . Its image shape changes during rotation because of laser illumination from one side and is reproducible approximately every 80 ms. Figure 3 Motion of the spinning particle along the surface of He-II recorded at the rate 2000 fps.…”
We report an experimental study of the 2D dynamics of active particles driven by quantum vortices on the free surface of superfluid helium at T = 1.45 К. The particle motion at short times (< 25 ms) relates to anomalous diffusion mode typical for active particles, while for longer times it corresponds to normal diffusion mode. The values of the rotational and translational kinetic energies of the particle allow to determine for the first time the intensity of the particle-vortex interaction and the dissipation rate of the vortex bundle energy. Strong bonding between a particle and a vortex is explained by coupling of normal and superfluid components.
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