报告人：张何朋（上海交通大学）

报告时间：2020年5月28日下午14:00-15:00

腾讯会议ID：876376142

报告摘要：

Active matter comprises individual units that convert energy into mechanical motion. In many examples, such as bacterial systems and biofilament assays, constituent units are elongated and can give rise to local nematic orientational order. Such `active nematics' systems have attracted much attention from both theorists and experimentalists. However, despite intense research efforts, data-driven quantitative modeling has not been achieved, a situation mainly due to the lack of systematic experimental data and to the large number of parameters of current models. Here we introduce a new active nematics system made of swarming filamentous bacteria. We simultaneously measure orientation and velocity fields and show that the complex spatiotemporal dynamics of our system can be quantitatively reproduced by a new type of microscopic model for active suspensions whose important parameters are all estimated from comprehensive experimental data. This provides unprecedented access to key effective parameters and mechanisms governing active nematics.  Our approach is applicable to different types of dense suspensions and shows a path towards more quantitative active matter research.

报告人简介

张何朋 2000年毕业于复旦大学物理系，2004年在美国纽约城市大学获得博士学位。2004年8月到美国得克萨斯大学奥斯丁分校从事研究工作。2010年加入上海交通大学自然科学研究院和物理与天文学院。关注软物质和生命系统中的力学和统计物理问题，已在美国科学院院刊（PNAS）、物理评论快报（PRL）等国际学术刊物发表论文30余篇。2014年当选国家自然科学基金优秀青年，2017年当选教育部青年长江学者。