Influence of particle softness on active glassy dynamics
Active matter studies are increasingly geared towards the high-density or glassy limit. This is mainly inspired by the remarkable resemblance between active glassy materials and conventional passive glassy matter. Interestingly, within this limit it has recently been shown that the relaxation dynami...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2022-11-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.4.L042033 |
| _version_ | 1797210609985519616 |
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| author | Vincent E. Debets Liesbeth M. C. Janssen |
| author_facet | Vincent E. Debets Liesbeth M. C. Janssen |
| author_sort | Vincent E. Debets |
| collection | DOAJ |
| description | Active matter studies are increasingly geared towards the high-density or glassy limit. This is mainly inspired by the remarkable resemblance between active glassy materials and conventional passive glassy matter. Interestingly, within this limit it has recently been shown that the relaxation dynamics of active quasihard spheres is nonmonotonic and most enhanced by activity when the intrinsic active length scale (e.g., the persistence length) is equal to the cage length, i.e., the length scale of local particle caging. This optimal enhancement effect is claimed to result from the most efficient scanning of local particle cages. Here we demonstrate that this effect and its physical explanation are fully retained for softer active spheres. We perform extensive simulations of athermal active Brownian particles (ABPs) and show that the nonmonotonic change of the relaxation dynamics remains qualitatively similar for varying softness. We explain quantitative differences by relating them to the longer range of the softer interaction potential, which decreases the cage length and obscures the intrinsic active motion. Moreover, we observe that only when the persistence length surpasses the cage length, distinct qualitative changes with respect to an equivalent passive Brownian particle system start to manifest themselves. Overall, our results further strengthen the importance of the cage length and its relation to the relevant active length scale in the context of active glassy materials. |
| first_indexed | 2024-04-24T10:13:19Z |
| format | Article |
| id | doaj.art-d55b88c099e54f818a602d6e9bd5d1ed |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:13:19Z |
| publishDate | 2022-11-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-d55b88c099e54f818a602d6e9bd5d1ed2024-04-12T17:26:21ZengAmerican Physical SocietyPhysical Review Research2643-15642022-11-0144L04203310.1103/PhysRevResearch.4.L042033Influence of particle softness on active glassy dynamicsVincent E. DebetsLiesbeth M. C. JanssenActive matter studies are increasingly geared towards the high-density or glassy limit. This is mainly inspired by the remarkable resemblance between active glassy materials and conventional passive glassy matter. Interestingly, within this limit it has recently been shown that the relaxation dynamics of active quasihard spheres is nonmonotonic and most enhanced by activity when the intrinsic active length scale (e.g., the persistence length) is equal to the cage length, i.e., the length scale of local particle caging. This optimal enhancement effect is claimed to result from the most efficient scanning of local particle cages. Here we demonstrate that this effect and its physical explanation are fully retained for softer active spheres. We perform extensive simulations of athermal active Brownian particles (ABPs) and show that the nonmonotonic change of the relaxation dynamics remains qualitatively similar for varying softness. We explain quantitative differences by relating them to the longer range of the softer interaction potential, which decreases the cage length and obscures the intrinsic active motion. Moreover, we observe that only when the persistence length surpasses the cage length, distinct qualitative changes with respect to an equivalent passive Brownian particle system start to manifest themselves. Overall, our results further strengthen the importance of the cage length and its relation to the relevant active length scale in the context of active glassy materials.http://doi.org/10.1103/PhysRevResearch.4.L042033 |
| spellingShingle | Vincent E. Debets Liesbeth M. C. Janssen Influence of particle softness on active glassy dynamics Physical Review Research |
| title | Influence of particle softness on active glassy dynamics |
| title_full | Influence of particle softness on active glassy dynamics |
| title_fullStr | Influence of particle softness on active glassy dynamics |
| title_full_unstemmed | Influence of particle softness on active glassy dynamics |
| title_short | Influence of particle softness on active glassy dynamics |
| title_sort | influence of particle softness on active glassy dynamics |
| url | http://doi.org/10.1103/PhysRevResearch.4.L042033 |
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