Journal
SOFT MATTER
Volume 16, Issue 35, Pages 8122-8127Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0sm00828a
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Funding
- taxpayers of South Korea through the Institute for Basic Science [IBS-R020-D1]
- Basic Science Research Program of the National Research Foundation(NRF) - Ministry of Education [2020R1A2C100976111]
- National Research Foundation of Korea [IBS-R020-D1-2020-A00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Particles kicked by external forces to produce mobility distinct from thermal diffusion are an iconic feature of the active matter problem. Here, we map this onto a minimal model for experiment and theory covering the wide time and length scales of usual active matter systems. A particle diffusing in a harmonic potential generated by an optical trap is kicked by programmed forces with time correlation at random intervals following the Poisson process. The model's generic simplicity allows us to find conditions for which displacements are Gaussian (or not), how diffusion is perturbed (or not) by kicks, and quantifying heat dissipation to maintain the non-equilibrium steady state in an active bath. The model reproduces experimental results of tracer mobility in an active bath of swimming algal cells. It can be used as a stochastic dynamic simulator for Brownian objects in various active baths without mechanistic understanding, owing to the generic framework of the protocol.
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