标题： 运动诱导相分离中的扩散瞬态 显示英文标题

标题： Diffusion Transients in Motility-Induced Phase Separation

摘要： 我们数值研究了在经历运动诱导相分离的二维无热活性粒子悬浮液中的正常扩散。 粒子被建模为具有固定自推进速度且取向弱波动的非手性朱诺斯圆盘。 当与整体悬浮液填充分数相关时，相关的扩散常数呈现出滞后环，在气相的共轭线和旋节线处有明显的跳跃。 在密集相的旋节线和共轭线之间没有观察到滞后环，因为它们似乎重叠。 此外，即使在稳态相分离下，粒子位移分布表现出非高斯的正常扩散，在存在（不存在）相分离的情况下，具有瞬时厚（薄）尾部。 显示英文摘要

摘要： We numerically investigate normal diffusion in a two-dimensional athermal suspension of active particles undergoing motility-induced phase separation. The particles are modeled as achiral Janus disks with fixed self-propulsion speed and weakly fluctuating orientation. When plotted versus the overall suspension packing fraction, the relevant diffusion constant traces a hysteresis loop with sharp jumps in correspondence with the binodal and spinodal of the gaseous phase. No hysteresis loop is observed between the spinodal and binodal of the dense phase, as they appear to overlap. Moreover, even under steady-state phase separation, the particle displacement distributions exhibit non-Gaussian normal diffusion with transient fat (thin) tails in the presence (absence) of phase separation.