报告人：中国科学院理论物理研究所 孟凡龙 副研究员

报告时间：2020/11/24 星期二 上午10:00

报告地点：近代物理系210会议室

报告主题：Modelling Collective Dynamics of Active/Driven Matter 

报告摘要：I will present the collective dynamics of three active/driven matter systems: magnetic colloids, magnetic microswimmers and cilia. (1) Magnetic colloids can exhibit interesting collective dynamics in confined enviroment, e.g., the tread-milling motion in presence of a wall and the ceilidh dance when sandwiched between two walls. (2) Magnetic microswimmers in a microfluidic channel can show various collective responses by external magnetic stimuli: radial focusing, longitudinal clustering and radial BEC. By applying analytic techniques and conducting Brownian dynamics simulation, we provide the critical conditions for these different dynamic modes of the microswimmers. (3) Beating cilia can coordinate with each other, beating in the form of a metachronal wave. We construct an analytical theory to deal with the emergent dynamics of an infinite array of cilia to understand the physical mechanism underlying the collective beating of the cilia. By performing analytical analyses, we provide the dispersion relation of the system, and predict the achievable stable wave vector region by linear stability analyses. Numerical simulations are also performed, the results of which matches well with our analytical predictions.

报告人简介：孟凡龙，中国科学院理论物理研究所副研究员。2010年本科毕业于中国科学技术大学近代物理系，2015年博士毕业于中国科学院理论物理研究所。2015年-2016年在剑桥大学卡文迪许实验室进行博士后研究，2016年-2018年在牛津大学Rudolf Peierls理论物理中心进行博士后研究，2018-2019年在马普动力学和自组织研究所从事博士后研究（2019.6-2019.11洪堡学者）。2019年12月，孟凡龙加入中国科学院理论物理研究所任副研究员。目前主要从事软物质和生物物理方面的理论研究，包括活性物质集体动力学理论，高分子网络流变学特性，液液相变理论等。