Speaker
Description
Flocking is one of the most spectacular emergent phenomena in active systems. It has been recently observed that, when self-propelled units interact with sufficiently strong disorder, polar order can arise even if the average couplings are antiferromagnetic: the non-equilibrium nature of active systems allows the system to spontaneously remove frustration and flock along a unique common direction.
We present a novel hydrodynamic approach to rationalize these findings. Interactions with quenched disorder can be taken into account by introducing a hierarchy of disordered fields: their coupling with standard hydrodynamic fields leads to the effect above-described and elucidate the nature of the flocking transition with quenched disorder. Finally, this hydrodynamic approach immediately generalizes to all hydrodynamic systems with quenched interactions: we thus open the door to a deeper quantitative understanding of many-body systems with quenched interactions.
| Role | Post Doc |
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