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Criticality of the zero-temperature jamming transition probed by self-propelled particles.

Content Provider	Semantic Scholar
Author	Liao, Qinyi Xu, Ning
Copyright Year	2018
Abstract	We perform simulations of athermal systems of self-propelled particles (SPPs) interacting via harmonic repulsion in the vicinity of the zero-temperature jamming transition at point J. Every particle is propelled by a constant force f pointing to a randomly assigned and fixed direction. When f is smaller than the yield force fy, the system is statically jammed. We find that fy increases with packing fraction and exhibits finite size scaling, implying the criticality of point J. When f > fy, SPPs flow forever and their velocities satisfy the k-Gamma distribution. Velocity distributions at various packing fractions and f collapse when the particle velocity is scaled by the average velocity v[combining macron], suggesting that v[combining macron] is a reasonable quantity to characterize the response to f. We thus define a response function R(ϕ,f) = v[combining macron](ϕ,f)/f. The function exhibits critical scaling nicely, implying again the criticality of point J. Our analysis and results indicate that systems of SPPs behave analogically to sheared systems, although their driving mechanisms are apparently distinct.
Starting Page	853
Ending Page	860
Page Count	8
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://scmp.ustc.edu.cn/Publications/2018/201803/P020180302580207852184.pdf
PubMed reference number	29308823v1
Alternate Webpage(s)	https://doi.org/10.1039/c7sm01909b
DOI	10.1039/c7sm01909b
Journal	Soft matter
Volume Number	14
Issue Number	5
Language	English
Access Restriction	Open
Subject Keyword	Arabic numeral 0 Duffy Blood group system Exhibits as Topic FUZ gene Gamma Distribution Particle PersonNameUse - assigned Small Test scaling criticality
Content Type	Text
Resource Type	Article

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