Mobility-induced phase separation in a binary mixture of active Brownian particles
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arXiv
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866911392394641408 |
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| author | Jiménez-Flores, D. Rodríguez-Rivas, A. Romero-Enrique, J. M. |
| author_facet | Jiménez-Flores, D. Rodríguez-Rivas, A. Romero-Enrique, J. M. |
| contents | In this paper, we report a Brownian dynamics simulation of the mobility-induced phase separation which occurs in a two-dimensional binary mixture of active soft Brownian particles, whose interactions are modeled by non-additive Weeks-Chandler-Andersen potentials inspired in Lennard-Jones potentials used for glass-forming passive mixtures. The analysis of structural properties, such as the radial distribution functions and the hexatic order parameter, shows that the high-density coexisting state in the binary case is spatially disordered, unlike the solid-like state observed for the monocomponent system. Characterization of the mean-square displacement of the active particles shows that both the low- and high-density coexisting states have diffusive behavior for long times. Thus, the high-density coexisting states are liquid-like in the binary cases. Moreover, diffusive behavior is also observed in the high-density solid-like state for the monocomponent system, which is driven by the presence of active topological defects. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_24761 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Mobility-induced phase separation in a binary mixture of active Brownian particles Jiménez-Flores, D. Rodríguez-Rivas, A. Romero-Enrique, J. M. Soft Condensed Matter In this paper, we report a Brownian dynamics simulation of the mobility-induced phase separation which occurs in a two-dimensional binary mixture of active soft Brownian particles, whose interactions are modeled by non-additive Weeks-Chandler-Andersen potentials inspired in Lennard-Jones potentials used for glass-forming passive mixtures. The analysis of structural properties, such as the radial distribution functions and the hexatic order parameter, shows that the high-density coexisting state in the binary case is spatially disordered, unlike the solid-like state observed for the monocomponent system. Characterization of the mean-square displacement of the active particles shows that both the low- and high-density coexisting states have diffusive behavior for long times. Thus, the high-density coexisting states are liquid-like in the binary cases. Moreover, diffusive behavior is also observed in the high-density solid-like state for the monocomponent system, which is driven by the presence of active topological defects. |
| title | Mobility-induced phase separation in a binary mixture of active Brownian particles |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2512.24761 |