Interacting particles in an activity landscape
We study interacting active Brownian particles (ABPs) with a space-dependent swim velocity via simulation and theory. We find that, although an equation of state exists, a mechanical equilibrium does not apply to ABPs in activity landscapes. The pressure imbalance originates in the flux of polar ord...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2022-01-01
|
| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/ac8e8c |
| _version_ | 1797748429238042624 |
|---|---|
| author | Adam Wysocki Anil K Dasanna Heiko Rieger |
| author_facet | Adam Wysocki Anil K Dasanna Heiko Rieger |
| author_sort | Adam Wysocki |
| collection | DOAJ |
| description | We study interacting active Brownian particles (ABPs) with a space-dependent swim velocity via simulation and theory. We find that, although an equation of state exists, a mechanical equilibrium does not apply to ABPs in activity landscapes. The pressure imbalance originates in the flux of polar order and the gradient of swim velocity across the interface between regions of different activity. An active–passive patch system is mainly controlled by the smallest global density for which the passive patch can be close packed. Below this density a critical point does not exist and the system splits continuously into a dense passive and a dilute active phase with increasing activity. Above this density and for sufficiently high activity the active phase may start to phase separate into a gas and a liquid phase caused by the same mechanism as motility-induced phase separation of ABPs with a homogeneous swim velocity. |
| first_indexed | 2024-03-12T16:04:37Z |
| format | Article |
| id | doaj.art-765be1e1f62c4417a981772652818d1f |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:04:37Z |
| publishDate | 2022-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-765be1e1f62c4417a981772652818d1f2023-08-09T14:25:08ZengIOP PublishingNew Journal of Physics1367-26302022-01-0124909301310.1088/1367-2630/ac8e8cInteracting particles in an activity landscapeAdam Wysocki0Anil K Dasanna1https://orcid.org/0000-0001-5960-4579Heiko Rieger2Department of Theoretical Physics and Center for Biophysics, Saarland University , Saarbrücken, GermanyDepartment of Theoretical Physics and Center for Biophysics, Saarland University , Saarbrücken, Germany; INM–Leibniz Institute for New Materials , Campus D2 2, 66123 Saarbrücken, GermanyDepartment of Theoretical Physics and Center for Biophysics, Saarland University , Saarbrücken, Germany; INM–Leibniz Institute for New Materials , Campus D2 2, 66123 Saarbrücken, GermanyWe study interacting active Brownian particles (ABPs) with a space-dependent swim velocity via simulation and theory. We find that, although an equation of state exists, a mechanical equilibrium does not apply to ABPs in activity landscapes. The pressure imbalance originates in the flux of polar order and the gradient of swim velocity across the interface between regions of different activity. An active–passive patch system is mainly controlled by the smallest global density for which the passive patch can be close packed. Below this density a critical point does not exist and the system splits continuously into a dense passive and a dilute active phase with increasing activity. Above this density and for sufficiently high activity the active phase may start to phase separate into a gas and a liquid phase caused by the same mechanism as motility-induced phase separation of ABPs with a homogeneous swim velocity.https://doi.org/10.1088/1367-2630/ac8e8cactive matterphase separationactivity landscapes |
| spellingShingle | Adam Wysocki Anil K Dasanna Heiko Rieger Interacting particles in an activity landscape New Journal of Physics active matter phase separation activity landscapes |
| title | Interacting particles in an activity landscape |
| title_full | Interacting particles in an activity landscape |
| title_fullStr | Interacting particles in an activity landscape |
| title_full_unstemmed | Interacting particles in an activity landscape |
| title_short | Interacting particles in an activity landscape |
| title_sort | interacting particles in an activity landscape |
| topic | active matter phase separation activity landscapes |
| url | https://doi.org/10.1088/1367-2630/ac8e8c |
| work_keys_str_mv | AT adamwysocki interactingparticlesinanactivitylandscape AT anilkdasanna interactingparticlesinanactivitylandscape AT heikorieger interactingparticlesinanactivitylandscape |