Yariv Kafri (Technion) | The long-ranged influence of disorder on active systems |


Active systems are a class of non-equilibrium systems in which each particle consumes and dissipates energy to self-propel or exert forces on its environment.
Examples range from bird flocks, through swarms of bacteria, to man-made colloidal systems. They have attracted enormous amount of attention in recent years due to the novel phases they exhibit, many without a counterpart in equilibrium system. The talk will give an overview of active systems and then focus on the impact of quenched random potentials on active matter. For dilute systems it will be shown that bulk disorder leads to generic long-range correlations, decaying as a power-law, and steady-state currents. Disorder localized along a wall confining the system leads to long-range density modulations and eddies whose amplitude decays as a power law with the distance from the wall, but whose extent grows with it. It will also be shown that disorder, even when localized on the boundary, can destroy bulk phase transitions in active systems.



When: May 18, 2022 2:00 PM (Israel Standard Time).

Where: Room 223, Multipurpose Bldg. & over Zoom