报告人：谭鹏（复旦大学物理系）

报告时间：2020年5月29日下午14:00-15:00

腾讯会议ID：606102068

报告摘要：

 

Because atoms and molecules are small in size and fast in motion, it is difficult to visualize them directly and probe their microscopic motions, which precludes a microscopic understanding on dynamics of condensed matter, such as phase transition kinetics and collective vibrations (normal modes). In contrast, micrometer-sized colloidal particles can serve as good model systems for these studies because thermal motions can be directly visualized and measured with video microscopy.

We will introduce our recent experimental studies in colloidal model systems: visualizing crystal nucleation and fast crystal growth. We developed a new method for bond order analysis to identify various local symmetries and applied it to illustrate kinetic pathways in colloidal crystallization. Our new analysis revealed multiple-symmetry precursors and nuclei, revealed their spatio-temporal fluctuations, and their role on the crystal growth speed and quality.  

报告人简介

谭鹏, 1982年9月出生，复旦大学物理系博士，香港中文大学物理系博士后，2014年加入复旦大学物理系，研究方向为软凝聚态物理中的相变和自组织现象，例如胶体系统中的结晶成核，晶体生长，固固转变，玻璃化和颗粒体系中的packing和自组织行为等。迄今在Nature Physics, Science Advances，Nature Communications，Physical Review Letters，PNAS等期刊上以通讯和第一作者发表论文10篇。