论文标题
活动景观中的相互作用颗粒
Interacting particles in an activity landscape
论文作者
论文摘要
我们通过模拟和理论研究了与空间依赖的游泳速度相互作用的活性布朗颗粒（ABP）。我们发现，尽管存在一个状态方程，但机械平衡不适用于活动景观中的ABP。压力差起源于极阶的通量和不同活性区域之间界面之间的游泳速度梯度。与具有均匀的游泳速度的运动诱导的ABP相位相比，活动量贴片系统不存在临界点，该系统不断地分成浓密的和稀释相，并且活动的活动增加。但是，如果全局密度很高，以至于并非所有粒子都可以填充在非活动贴片上，则恢复了类似MIPS的行为并再次平衡压力。
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.
