Collective motion of self-propelled particles with memory

Ken H. Nagai, Yutaka Sumino, Raul Montagne, Igor S. Aranson, Hugues Chaté

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

We show that memory, in the form of underdamped angular dynamics, is a crucial ingredient for the collective properties of self-propelled particles. Using Vicsek-style models with an Ornstein-Uhlenbeck process acting on angular velocity, we uncover a rich variety of collective phases not observed in usual overdamped systems, including vortex lattices and active foams. In a model with strictly nematic interactions the smectic arrangement of Vicsek waves giving rise to global polar order is observed. We also provide a calculation of the effective interaction between vortices in the case where a telegraphic noise process is at play, explaining thus the emergence and structure of the vortex lattices observed here and in motility assay experiments.

Original languageEnglish (US)
Article number168001
JournalPhysical review letters
Volume114
Issue number16
DOIs
StatePublished - Apr 24 2015

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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