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Superfluid swimmers
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DOI：10.1103/PhysRevResearch.3.013188.png)
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Abstract
En 中文
The propulsion of living microorganisms ultimately relies on viscous drag for body-fluid interactions. The self-locomotion in superfluids such as He-4 is deemed impossible due to the apparent lack of viscous resistance. Here, we investigate the self-propulsion of a Janus (two-face) light-absorbing particle suspended in superfluid helium He-4 (He-II). The particle is energized by the heat flux due to the absorption of light from an external source. We show that a quantum mechanical propulsion force originates due to the transformation of the superfluid to a normal fluid on the heated particle face. The theoretical analysis is supported by the numerical solution of the Ginzburg-Landau-Khalatnikov model for a superfluid. Our results shed light on the dynamics of inclusions in a superfluid and stimulate experiments.
Keywords:
LIQUID-HELIUM
VORTICES
NUCLEATION
TURBULENCE
WAVES
SOUND
MODEL
2ND
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