☆ 4.8 Editorial Material

Obstacles need not impede cooperation in active matter

NATURE (2022)

Packed Swarms on Dirt: Two-Dimensional Incompressible flocks with Quenched and Annealed Disorder

Leiming Chen et al.

Summary: This study investigates the ordered phase of incompressible polar active fluids in the presence of quenched disorder in two dimensions. The research reveals the robustness of the ordered state and provides scaling laws. The findings have significant implications for understanding the coherent motion of biological systems.

PHYSICAL REVIEW LETTERS (2022)

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Article Physics, Multidisciplinary

Breakdown of Ergodicity and Self-Averaging in Polar Flocks with Quenched Disorder

Yu Duan et al.

Summary: The study reveals that spatial quenched disorder has a more complex and profound impact on polar active matter than previously believed. Simulations of the 2D Vicsek model show that in the ordered phase, ergodicity is lost, and the nature of the system depends qualitatively on the type of quenched disorder: random couplings lead to long-range ordered system, while random scatterers result in non-self-averaging with dominating sample-to-sample fluctuations.

PHYSICAL REVIEW LETTERS (2021)

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Article Physics, Fluids & Plasmas