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Two-dimensional Brownian motion of active particle on superfluid helium surface.

ABSTRACT: 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.

SUBMITTER: Boltnev RE

PROVIDER: S-EPMC10728076 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature

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Two-dimensional Brownian motion of active particle on superfluid helium surface.

Boltnev Roman E RE Vasiliev Mikhail M MM Petrov Oleg F OF

Scientific reports 20231218 1

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 ...[more]

PMID: 38110441

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