南京师范大学物理科学与技术学院报告视频--徐莉梅

报告人：徐莉梅

题目：Connectivity between structure and dynamic in glass-forming liquids

单位：北京大学

报告时间：2018年11月14日

报告地点：南京师范大学

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个人简介

徐莉梅

北京大学物理学院教授，博士生导师

国家自然科学基金委杰出青年基金获得者

国家青年千人计划入选者

徐莉梅教授主要从事凝聚态物理、表面物理、统计物理等方面的研究，主要研究方向包括临界现象及相变、界面分子的谱学研究、液体的结构与动力学等。2011年入选国家千人计划-青年千人；2015年获批国家自然科学基金委杰出青年基金；现任中国物理学会理事会理事、中国物理学会凝聚态理论与统计物理专委会秘书长；担任《中国物理》杂志编委。

报告简介

The structural description for the link between the fast vibrational dynamics and slow diffusive dynamics inglass-forming systems is one of the most challenging issues in physical science. Dynamic crossover is observed in many glass-forming liquids. Different scenarios, such phase transition, partial crystallization or glass transition, are proposed to explain such phenomenon. In this talk, I will discuss the structural origin and its correlation with dynamic transition in super cooledliquids. Particularly, in a model of metallic supercooled liquid, we find that local connectivity as an atomic-level structural order parameter tunes the short-time vibrational excitations of the icosahedrally coordinated particles and meanwhile modulates their long-time relaxation dynamics changing from stretched to compressed exponentials, denoting a dynamic transition from diffusive to hyperdiffusive motions. Our result indicates that long-time dynamics has a structural origin, thus suggesting a structural link the fast vibrational dynamics and the slow structural relaxation in glassy materials.

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