There are a variety of systems that exhibit chiral dynamics, including vortices in fluids and superfluids, charges in magnetic fields, coupled gyroscopes, and rotating colloids. Similar dynamics appear for skyrmions in chiral magnets, where the Magnus force leads to the appearance of a Hall angle for moving skyrmions. Here, we show how the Magnus force affects the skyrmion scattering and depinning, and demonstrate that inclusion of quenched disorder leads to a drive-dependent Hall effect. For chiral active matter, we observe effects similar to those found for skyrmions where a driven probe particle moving through a bath of chiral active particles has a finite Hall angle, and collections of active chiral disks can exhibit edge currents and rotating crystal states. We also consider repulsive particles that form triangular lattices in the absence of activity. When active rotation is introduced in which two species are out of phase with each other, we find that the system can organize into a remarkable variety of nonequilibrium crystals, including paired or dimer crystal lattices, stripes, and glassy states. We discuss how the out-of-phase rotation leads to an effective short-range attraction between the two species which competes with a long-range pairwise repulsion. We call these states phase time crystals.
Charles Reichhardt, Los Alamos Laboratory Fellow, Theoretical Division, Los Alamos National Laboratory
Host: Adilson Motter
Joan West
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