第十届亚太动力学大会报告视频--徐宁

扫码观看本次报告视频

题目：Quasicrystal formation in monodisperse soft-core particle systems

报告人：徐宁

单位：中国科学技术大学

地点：华侨大学

时间：2018年11月2日

报告摘要

For soft-core particle systems interacting via a spring-like repulsion, we surprisingly observe the existence of two-dimensional quasicrystals at high densities. Up to now, quasicrystals have been found in multi-component systems such as alloys and in mono-component systems with multiple length scales in particle interactions or with anisotropic particles such as tetrahedral and patchy particles. In all these systems, multiple length scales are present in particle size, interaction, or anisotropy, which seem to be the consensual condition for quasicrystals to occur. The quasicrystals that we found are unexpectedly formed by monodisperse, isotropic particles interacting via the simple soft-core potential without multiple length scales. We find not only dodecagonal but also octagonal quasicrystals, which have not been found yet in soft quasicrystals. In our quasicrystals, particles tend to form pentagons. A pentagon surrounded by an n-fold polygon constructs the complex structural unit to develop the n-fold quasicrystalline order. In liquid states prior to the liquid-solid transition, we already observe some signs of the development of the quasicrystalline order, including the accumulation of pentagons and the emergence of two competing length scales. We have also verified that our quasicrystals are stable by showing that their formation is independent of history and they have the lowest inherent structure potential energy, compared with other crystalline states. 

个人简介

徐宁，中国科学技术大学物理系教授。2010年作为中国科学院“百人计划”引进到中国科学技术大学物理系，并先后受聘于中国科学院软物质化学重点实验室和合肥微尺度物质科学国家实验室，2011年受聘为香港中文大学物理系杨振宁访问学者，2013年获得国家自然科学基金委杰出青年科学基金的资助，2014年入选国家百千万人才工程并被授予“有突出贡献中青年专家”荣誉称号，2015年荣获中国科学技术大学海外校友基金会青年科学家杰出成就奖。目前的研究方向是非晶态胶体、玻璃、颗粒物质等体系的相变、动力学、流变；胶体结晶与熔融、准晶、固固相变；非平衡态统计物理。

END

更多精彩视频登陆网站

https://www.am-stc.com/