Non-Gaussian Displacements in Active Transport on a Carpet of Motile Cells.
Phys Rev Lett
; 132(8): 088301, 2024 Feb 23.
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| MEDLINE
| ID: mdl-38457713
ABSTRACT
We study the dynamics of micron-sized particles on a layer of motile cells. This cell carpet acts as an active bath that propels passive tracer particles via direct mechanical contact. The resulting nonequilibrium transport shows a crossover from superdiffusive to normal-diffusive dynamics. The particle displacement distribution is distinctly non-Gaussian even at macroscopic timescales exceeding the measurement time. We obtain the distribution of diffusion coefficients from the experimental data and introduce a model for the displacement distribution that matches the experimentally observed non-Gaussian statistics. We argue why similar transport properties are expected for many composite active matter systems.
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