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Condensed Matter > Soft Condensed Matter

Title: Fluid-Glass-Jamming Rheology of Soft Active Brownian Particles

Abstract: We study the shear rheology of a binary mixture of soft Active Brownian Particles, from the fluid to the disordered solid regime. At low shear rates, we find a Newtonian regime, where a Green-Kubo relation with an effective temperature provides the linear viscosity. It is followed by a shear-thinning regime at larger shear rates. A solid regime at high densities is signalled by the emergence of a finite yield stress. We construct a "fluid-glass-jamming" phase diagram, in which the temperature axis is replaced by activity. Although activity, like temperature, increases the amount of fluctuations in the system, it plays a different role, as it changes the exponent characterizing the decay of the diffusivity close to the glass transition and the shape of the yield stress surface. The dense disordered active solid appears to be mostly dominated by athermal jamming rather than glass rheology.
Comments: 6 pages, 5 figures
Subjects: Soft Condensed Matter (cond-mat.soft); Statistical Mechanics (cond-mat.stat-mech); Biological Physics (physics.bio-ph)
Cite as: arXiv:2303.11245 [cond-mat.soft]
  (or arXiv:2303.11245v1 [cond-mat.soft] for this version)

Submission history

From: Roland Wiese [view email]
[v1] Mon, 20 Mar 2023 16:30:40 GMT (421kb,D)
[v2] Tue, 16 May 2023 16:22:06 GMT (424kb,D)
[v3] Mon, 16 Oct 2023 16:27:22 GMT (518kb,D)

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