Collective Hall current in chiral active fluids: Coupling of phase and mass transport through traveling bands
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866918019476750336 |
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| author | Siebers, Frank Bebon, Robin Jayaram, Ashreya Speck, Thomas |
| author_facet | Siebers, Frank Bebon, Robin Jayaram, Ashreya Speck, Thomas |
| contents | Active fluids composed of constituents that are constantly driven away from thermal equilibrium can support spontaneous currents and can be engineered to have unconventional transport properties. Here we report the emergence of (meta-)stable traveling bands in computer simulations of aligning circle swimmers. These bands are different from polar flocks and we show that they can be understood as non-dispersive soliton solutions of the underlying non-linear hydrodynamic equations with constant celerity (phase propagation speed) that is much larger than the propulsion speed. In contrast to solitons in passive media, these bands can induce a bulk particle current with a component perpendicular to the propagation direction, thus constituting a collective Hall (or Magnus) effect. Traveling bands require sufficiently small orbits and undergo a discontinuous transition into a synchronized state with transient polar clusters for large orbital radii. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2307_11115 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Collective Hall current in chiral active fluids: Coupling of phase and mass transport through traveling bands Siebers, Frank Bebon, Robin Jayaram, Ashreya Speck, Thomas Soft Condensed Matter Pattern Formation and Solitons Active fluids composed of constituents that are constantly driven away from thermal equilibrium can support spontaneous currents and can be engineered to have unconventional transport properties. Here we report the emergence of (meta-)stable traveling bands in computer simulations of aligning circle swimmers. These bands are different from polar flocks and we show that they can be understood as non-dispersive soliton solutions of the underlying non-linear hydrodynamic equations with constant celerity (phase propagation speed) that is much larger than the propulsion speed. In contrast to solitons in passive media, these bands can induce a bulk particle current with a component perpendicular to the propagation direction, thus constituting a collective Hall (or Magnus) effect. Traveling bands require sufficiently small orbits and undergo a discontinuous transition into a synchronized state with transient polar clusters for large orbital radii. |
| title | Collective Hall current in chiral active fluids: Coupling of phase and mass transport through traveling bands |
| topic | Soft Condensed Matter Pattern Formation and Solitons |
| url | https://arxiv.org/abs/2307.11115 |