https://doi.org/10.1140/epje/s10189-024-00431-w
Regular Article - Flowing Matter
Phase separation, edge currents, and Hall effect for active matter with Magnus dynamics
1
Mathematics and Computer Science Department, Babeş-Bolyai University, 400084, Cluj, Romania
2
Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, 87545, Los Alamos, NM, USA
Received:
8
January
2024
Accepted:
6
May
2024
Published online:
6
June
2024
We examine run-and-tumble disks in two-dimensional systems where the particles also have a Magnus component to their dynamics. For increased activity, we find that the system forms a motility-induced phase-separated (MIPS) state with chiral edge flow around the clusters, where the direction of the current is correlated with the sign of the Magnus term. The stability of the MIPS state is non-monotonic as a function of increasing Magnus term amplitude, with the MIPS region first extending down to lower activities followed by a break up of MIPS at large Magnus amplitudes into a gel-like state. We examine the dynamics in the presence of quenched disorder and a uniform drive and find that the bulk flow exhibits a drive-dependent Hall angle. This is a result of the side jump effect produced by scattering from the pinning sites and is similar to the behavior found for skyrmions in chiral magnets with quenched disorder.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
