Bickmann Jens, Bröker Stephan, Jeggle Julian, Wittkowski Raphael
Center for Soft Nanoscience, Institut für Theoretische Physik, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany.
J Chem Phys. 2022 May 21;156(19):194904. doi: 10.1063/5.0085122.
We consider chirality in active systems by exemplarily studying the phase behavior of planar systems of interacting Brownian circle swimmers with a spherical shape. For this purpose, we derive a predictive field theory that is able to describe the collective dynamics of circle swimmers. The theory yields a mapping between circle swimmers and noncircling active Brownian particles and predicts that the angular propulsion of the particles leads to a suppression of their motility-induced phase separation, being in line with recent simulation results. In addition, the theory provides analytical expressions for the spinodal corresponding to the onset of motility-induced phase separation and the associated critical point as well as for their dependence on the angular propulsion of the circle swimmers. We confirm our findings by Brownian dynamics simulations. Agreement between results from theory and simulations is found to be good.
我们通过示例性地研究具有球形形状的相互作用布朗圆泳者平面系统的相行为，来考虑活性系统中的手性。为此，我们推导了一种预测性场论，它能够描述圆泳者的集体动力学。该理论给出了圆泳者与非圆周运动的活性布朗粒子之间的映射关系，并预测粒子的角推进导致其运动诱导相分离受到抑制，这与最近的模拟结果一致。此外，该理论还提供了对应于运动诱导相分离起始的旋节线以及相关临界点的解析表达式，以及它们对圆泳者角推进的依赖性。我们通过布朗动力学模拟证实了我们的发现。理论结果与模拟结果之间的一致性良好。
