Enhanced particle diffusion in fluctuating binary environments
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
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2025
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| author | Perakis, Fivos Kawasaki, Takeshi Saito, Shinji |
| author_facet | Perakis, Fivos Kawasaki, Takeshi Saito, Shinji |
| contents | We investigate single-particle diffusion in a two-state Langevin model where the friction coefficient randomly switches between low-friction (liquid-like) and high-friction (glassy-like) states. The dynamics are governed by the ratio between the friction switching time $τ$ and the intrinsic velocity relaxation time $τ_0$. For fast switching ($τ/τ_0 \lesssim 1$) the motion is homogeneous and Brownian, whereas for slow switching ($τ/τ_0 \gg 1$) the particle exhibits intermittent dynamics and an enhanced diffusion coefficient. Analysis of the single-particle overlap function $Q(t)$ and the dynamic susceptibility $χ_4(t)$ reveals decoupling of the diffusion coefficient from the average friction upon cooling, which coincides with increasing temporal dynamic heterogeneity. This minimal model provides a transparent framework for understanding single-particle transport in media with fluctuating local mobility, including supercooled liquids and phase-separated soft materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_02776 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Enhanced particle diffusion in fluctuating binary environments Perakis, Fivos Kawasaki, Takeshi Saito, Shinji Chemical Physics Soft Condensed Matter We investigate single-particle diffusion in a two-state Langevin model where the friction coefficient randomly switches between low-friction (liquid-like) and high-friction (glassy-like) states. The dynamics are governed by the ratio between the friction switching time $τ$ and the intrinsic velocity relaxation time $τ_0$. For fast switching ($τ/τ_0 \lesssim 1$) the motion is homogeneous and Brownian, whereas for slow switching ($τ/τ_0 \gg 1$) the particle exhibits intermittent dynamics and an enhanced diffusion coefficient. Analysis of the single-particle overlap function $Q(t)$ and the dynamic susceptibility $χ_4(t)$ reveals decoupling of the diffusion coefficient from the average friction upon cooling, which coincides with increasing temporal dynamic heterogeneity. This minimal model provides a transparent framework for understanding single-particle transport in media with fluctuating local mobility, including supercooled liquids and phase-separated soft materials. |
| title | Enhanced particle diffusion in fluctuating binary environments |
| topic | Chemical Physics Soft Condensed Matter |
| url | https://arxiv.org/abs/2512.02776 |