Active Matter Shepherding and Clustering in Inhomogeneous Environments
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
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2021
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| author | Forgacs, P. Libal, A. Reichhardt, C. Reichhardt, C. J. O. |
| author_facet | Forgacs, P. Libal, A. Reichhardt, C. Reichhardt, C. J. O. |
| contents | We consider a mixture of active and passive run-and-tumble disks in an inhomogeneous environment where only half of the sample contains quenched disorder or pinning. The disks are initialized in a fully mixed state of uniform density. We identify several distinct dynamical phases as a function of motor force and pinning density. At high pinning densities and high motor forces, there is a two step process initiated by a rapid accumulation of both active and passive disks in the pinned region, which produces a large density gradient in the system. This is followed by a slower species phase separation process where the inactive disks are shepherded by the active disks into the pin-free region, forming a non-clustered fluid and producing a more uniform density with species phase separation. For higher pinning densities and low motor forces, the dynamics becomes very slow and the system maintains a strong density gradient. For weaker pinning and large motor forces, a floating clustered state appears and the time averaged density of the system is uniform. We illustrate the appearance of these phases in a dynamic phase diagram. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2107_12508 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | Active Matter Shepherding and Clustering in Inhomogeneous Environments Forgacs, P. Libal, A. Reichhardt, C. Reichhardt, C. J. O. Soft Condensed Matter We consider a mixture of active and passive run-and-tumble disks in an inhomogeneous environment where only half of the sample contains quenched disorder or pinning. The disks are initialized in a fully mixed state of uniform density. We identify several distinct dynamical phases as a function of motor force and pinning density. At high pinning densities and high motor forces, there is a two step process initiated by a rapid accumulation of both active and passive disks in the pinned region, which produces a large density gradient in the system. This is followed by a slower species phase separation process where the inactive disks are shepherded by the active disks into the pin-free region, forming a non-clustered fluid and producing a more uniform density with species phase separation. For higher pinning densities and low motor forces, the dynamics becomes very slow and the system maintains a strong density gradient. For weaker pinning and large motor forces, a floating clustered state appears and the time averaged density of the system is uniform. We illustrate the appearance of these phases in a dynamic phase diagram. |
| title | Active Matter Shepherding and Clustering in Inhomogeneous Environments |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2107.12508 |