Dynamical anomalies and structural features of Active Brownian Particles characterised by two repulsive length scales
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
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2022
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| _version_ | 1866917697529315328 |
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| author | Martin-Roca, Jose Martinez, Raul Martinez-Pedrero, Fernando Ramirez, Jorge Valeriani, Chantal |
| author_facet | Martin-Roca, Jose Martinez, Raul Martinez-Pedrero, Fernando Ramirez, Jorge Valeriani, Chantal |
| contents | In this work we study a two-dimensional system composed by Active Brownian Particles (ABPs) interacting via a repulsive potential with two-length-scales, a soft shell and a hard-core. Depending on the ratio between the strength of the soft shell barrier and the activity, we find two regimes: If this ratio is much larger or smaller than 1, the observed behaviour is comparable with ABPs interacting via a single length-scale potential. If this ratio is similar to 1, the two length-scales are relevant for both structure and dynamical properties. On the structural side, when the system exhibits a motility induced phase separation, the dense phase is characterised by new and more complex structures compared with the hexatic phase observed in single length-scale systems. On the dynamical side, as far as we are aware, this is the first representation of an anomalous dynamics in active particles. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2202_03768 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Dynamical anomalies and structural features of Active Brownian Particles characterised by two repulsive length scales Martin-Roca, Jose Martinez, Raul Martinez-Pedrero, Fernando Ramirez, Jorge Valeriani, Chantal Soft Condensed Matter In this work we study a two-dimensional system composed by Active Brownian Particles (ABPs) interacting via a repulsive potential with two-length-scales, a soft shell and a hard-core. Depending on the ratio between the strength of the soft shell barrier and the activity, we find two regimes: If this ratio is much larger or smaller than 1, the observed behaviour is comparable with ABPs interacting via a single length-scale potential. If this ratio is similar to 1, the two length-scales are relevant for both structure and dynamical properties. On the structural side, when the system exhibits a motility induced phase separation, the dense phase is characterised by new and more complex structures compared with the hexatic phase observed in single length-scale systems. On the dynamical side, as far as we are aware, this is the first representation of an anomalous dynamics in active particles. |
| title | Dynamical anomalies and structural features of Active Brownian Particles characterised by two repulsive length scales |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2202.03768 |