We study nonequilibrium analogues of surface phase transitions in a minimal model of active particles in contact with a purely repulsive potential barrier that mimics a thin porous membrane. Under conditions of bulk motility-induced phase separation, the interaction strength ${ϵ}_w$ of the barrier controls the affinity of the dense phase for the barrier region. We uncover clear signatures of a wetting phase transition as ${ϵ}_w$ is varied. In common with its equilibrium counterpart, the character of this transition depends on the system dimensionality: a continuous transition with large density fluctuations and gas bubbles is uncovered in 2D while 3D systems exhibit a sharp transition absent of large correlations.

中文翻译：

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活性布朗粒子在薄膜上的润湿转变

我们在与模拟多孔薄膜的纯排斥势垒接触的最小模型中研究表面相变的非平衡类似物。在体运动诱导相分离条件下，相互作用强度${\epsilon }_{瓦}$势垒控制密相对势垒区的亲和力。我们发现了润湿相变的清晰特征，如${\epsilon }_{瓦}$是多种多样的。与其平衡对应物一样，这种转变的特征取决于系统维度：在 2D 中发现具有大密度波动和气泡的连续转变，而 3D 系统则表现出没有大相​​关性的急剧转变。