Flocking Beyond One Species: Novel Phase Coexistence in a Generalized Two-Species Vicsek Model
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arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866910039714824192 |
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| author | Lardet, Eloise Chen, Letian Bertrand, Thibault |
| author_facet | Lardet, Eloise Chen, Letian Bertrand, Thibault |
| contents | A hallmark in natural systems, self-organization often stems from very simple interaction rules between individual agents. While single-species self-propelled particle (SPP) systems are well understood, the behavior of binary mixtures with general alignment interactions remains largely unexplored with a few scattered results hinting at the existence of a rich emergent phase behavior. Here, we investigate systematically a generalization of the two-species Vicsek model with reciprocal intra- and interspecies (anti-)alignment couplings, uncovering a rich phenomenology of emergent states. Notably, we show that rather than destroying polar order, anti-aligning interactions can promote phase separation and the emergence of global polar order. In doing so, we uncover a novel mechanism for microphase separation. We further find these coexistence patterns can be generalized to multi-species systems with cyclic alignment interactions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_17617 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Flocking Beyond One Species: Novel Phase Coexistence in a Generalized Two-Species Vicsek Model Lardet, Eloise Chen, Letian Bertrand, Thibault Soft Condensed Matter Statistical Mechanics A hallmark in natural systems, self-organization often stems from very simple interaction rules between individual agents. While single-species self-propelled particle (SPP) systems are well understood, the behavior of binary mixtures with general alignment interactions remains largely unexplored with a few scattered results hinting at the existence of a rich emergent phase behavior. Here, we investigate systematically a generalization of the two-species Vicsek model with reciprocal intra- and interspecies (anti-)alignment couplings, uncovering a rich phenomenology of emergent states. Notably, we show that rather than destroying polar order, anti-aligning interactions can promote phase separation and the emergence of global polar order. In doing so, we uncover a novel mechanism for microphase separation. We further find these coexistence patterns can be generalized to multi-species systems with cyclic alignment interactions. |
| title | Flocking Beyond One Species: Novel Phase Coexistence in a Generalized Two-Species Vicsek Model |
| topic | Soft Condensed Matter Statistical Mechanics |
| url | https://arxiv.org/abs/2503.17617 |