The long-ranged influence of disorder on active systems

by Prof. Yariv Kafri

Faculty Of Physics, Technion - Israel Institute Of Technology

at Biological and soft-matter physics

Thu, 18 Mar 2021, 12:10
ZOOM only - Meeting ID: 874 2021 0979

Abstract

Active matter is a class of non-equilibrium systems consisting of particles that propel themselves by consuming energy. They thus span a wide range of physical systems including biological, granular, and colloidal. The talk will describe the impact of random quenched potentials on a class of systems known as scalar active matter. This class of systems is known to undergo motility-induced phase separation even in the absence of attractive interactions between the particles. By building on insights on the effects of a localized speck of disorder on scalar active systems it will be argued that: 1) The lower critical dimension below which phase separation is not observed asymptotically is dc=4. 2) The system has a weak-disorder regime in which the structure factor scales as S(q)∼1/q^2. In d = 2 we predict that, at larger scales, the behavior should cross over to a strong-disorder regime. In d>2, these two regimes exist separately, depending on the strength of the potential. Time permitting I will also describe results for the one-dimensional system.

Join Zoom Meeting
https://us02web.zoom.us/j/87420210979

Meeting ID: 874 2021 0979

Created on 22-02-2021 by Granek, Rony (rgranek)
Updaded on 12-03-2021 by Granek, Rony (rgranek)