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Diffusion transients in motility-induced phase separation
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DOI：10.1103/PhysRevResearch.7.013153.png)
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We numerically investigate normal diffusion in a two-dimensional athermal suspension of active particles undergoing motility-induced phase separation. The particles are modeled as achiral Janus disks with fixed self-propulsion speed and weakly fluctuating orientation. When plotted versus the overall suspension packing fraction, the relevant diffusion constant traces a hysteresis loop with sharp jumps in correspondence with the binodal and spinodal of the gaseous phase. No hysteresis loop is observed between the spinodal and binodal of the dense phase, as they appear to overlap. Moreover, even under steady-state phase separation, the particle displacement distributions exhibit non-Gaussian normal diffusion with transient fat (thin) tails in the presence (absence) of phase separation.
Keyword:
GAUSSIAN BROWNIAN DIFFUSION
JANUS PARTICLES
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4.2
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7.6K
被引数:
2.7W
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