标题： 无张力相分离群体感应系统的界面稳定性 显示英文标题

标题： Interfacial Stability in Tensionless Phase-Separated Quorum-Sensing Systems

摘要： 活性粒子运动诱导相分离的界面现象挑战了我们对相共存的传统理解。 尽管现实中的活性粒子之间普遍存在非机械通信耦合，但大多数关于活性界面的研究都集中在仅具有立体粒子相互作用的活性布朗系统上。 在这里，我们通过理论和模拟研究了仅通过群体感知通信相互作用的相分离活性粒子的界面行为。 显著的是，我们发现群体感知活性系统表现出消失的机械表面张力，但具有非零的有效毛细管表面张力。 我们进一步证明，无张力界面的机械平衡由界面处的极化力维持；而其动力学则由表面刚度所主导，该刚度来源于局部界面变形引起的切向粒子通量。 我们的工作揭示了活性物质中机械和毛细管表面张力的根本区别，并为未来探索活性界面现象铺平了道路。 显示英文摘要

摘要： Interfacial phenomena of motility-induced phase separation of active particles challenge our conventional understanding of phase coexistence. Despite the ubiquity of nonmechanical communication couplings among real active particles, most works on active interface have concentrated on active Brownian systems with steric interparticle interactions. Here, we study the interfacial behavior of phase-separated active particles interacting solely via quorum-sensing communications using both theory and simulations. Strikingly, we find that the quorum-sensing active system exhibits vanishing mechanical surface tension but nonzero effective capillary surface tension. We further demonstrate that the mechanical equilibrium of the tensionless interface is sustained by polarization force at the interface; while its dynamics is governed by the surface stiffness, which arises from tangential particle flux induced by local interfacial deformation. Our work reveals the fundamental distinction between mechanical and capillary surface tensions in active matter and paves the way for future exploration of active interface phenomena.