软活性物质中通过协同机制传递迁移率
Transmission of mobility via cooperative mechanisms in soft active matter
AI总结：
本文研究软活性物质中少量活性分子触发流化相变的现象，发现活性分子的迁移率通过介质协同机制传递给非活性分子，并与促进理论一致。
摘要：
当过冷时，液体的黏度在接近玻璃化转变温度时急剧增加。尽管这种行为的物理起源仍未被理解，但现已充分证实，加入少量活化粒子能够逆转这种黏度增加。在此，我们进一步提出该流化过程的极限问题，以及流化液体与其黏性对应物之间的差异问题。结果表明，百分之几的活性分子足以触发一种相变，导致出现液体典型的扩散系数，同时介质保留黏性相的协同性质。活性与非活性分子协同性质之间的相似性表明，活性分子的迁移率通过介质的协同机制传递给非活性分子，这一结果与促进理论一致。随后，通过比较最活跃的活性分子与非活性分子的不同 van Hove 关联函数的行为，证实了这一结果。有趣的是，在我们的模拟中，协同机制并非由激发浓度的降低所诱导，也与之无关。
英文摘要：
When supercooled, liquids viscosity increases dramatically as the glass transition temperature is approached. While the physical origin of this behavior is still not understood, it is now well established that the addition of a few activated particles is able to reverse that increase in viscosity. Here we further raise the question of a limit in that fluidization process and of the differences between the fluidized liquid and its viscous counterpart. Results show that a few percent active molecules are enough to trigger a phase transition leading to diffusion coefficients typical of liquids while the medium retains cooperative properties of the viscous phase. The similarity between cooperative properties of the active and non active molecules suggests that the mobility of active molecules is transmitted to inactive ones via the medium cooperative mechanisms, a result in agreement with facilitation theories. This result is then confirmed by the compared behavior of the distinct van hove correlation functions of most mobile active and non active molecules. Interestingly enough, in our simulations the cooperative mechanisms are not induced or related to a decrease of the excitation concentration.
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