Journal
PHYSICAL REVIEW LETTERS
Volume 114, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.168001
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Funding
- JSPS [23-1819]
- U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division
- [26103505]
- [24740287]
- Grants-in-Aid for Scientific Research [26103505] Funding Source: KAKEN
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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.
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