活性景观中的相互作用粒子
Interacting particles in an activity landscape
AI总结：
该研究通过模拟与理论探究空间依赖游动速度的相互作用活性布朗粒子，揭示活性景观中ABPs无力学平衡的压差来源，明确主动-被动斑块系统无临界点，及高密度下恢复类运动诱导相分离行为的规律。
摘要：
我们通过模拟与理论方法研究具有空间依赖游动速度的相互作用活性布朗粒子（active Brownian particles, ABPs）。研究发现，尽管存在状态方程，但处于活性景观中的ABPs并不满足力学平衡条件。压差来源于极性序通量，以及不同活性区域界面两侧的游动速度梯度。与具有均一游动速度的ABPs的运动诱导相分离（motility-induced phase separation, MIPS）不同，主动-被动斑块系统不存在临界点，随着活性升高，该系统会持续分裂为密相和稀相。但如果全局密度过高，以至于所有粒子无法全部堆积在非活性斑块上时，系统会恢复类MIPS行为，压力也会重新达到平衡。
英文摘要：
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 difference originates in the flux of polar order and the gradient of swim velocity across the interface between regions of different activity. In contrast to motility-induced phase separation of ABPs with a homogeneous swim velocity, a critical point does not exist for an active-passive patch system, which continuously splits into a dense and a dilute phase with increasing activity. However, if the global density is so high that not all particles can be packed onto the inactive patch, then MIPS-like behavior is restored and the pressure is balanced again.
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