Universal origin of glassy relaxation as recognized by configuration pattern matching  

作　　者：Hai-Bin Yu Liang Gao Jia-Qi Gao Konrad Samwer 

机构地区：[1]Wuhan National High Magnetic Field Center and School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China [2]I.Physikalisches Institut,Universität Götingen,Götingen D-37077,Germany

出　　处：《National Science Review》2024年第5期336-344,共9页国家科学评论（英文版）

基　　金：supported by the National Natural Science Foundation of China(52071147);the National Thousand Young Talents Program of China.K.S.received support from Deutsche Forschungsgemeinschaft(DFG)via the Leibniz Program and SFB 1073.

摘　　要：Relaxation processes are crucial for understanding the structural rearrangements of liquids and amorphous materials.However,the overarching principle that governs these processes across vastly different materials remains an open question.Substantial analysis has been carried out based on the motions of individual particles.Here,as an alternative,we propose viewing the global configuration as a single entity.We introduce a global order parameter,namely the inherent structure minimal displacement(IS D_(min)),to quantify the variability of configurations by a pattern-matching technique.Through atomic simulations of seven model glass-forming liquids,we unify the influences of temperature,pressure and perturbation time on the relaxation dissipation,via a scaling law between the mechanical damping factor and IS Dmin.Fundamentally,this scaling reflects the curvature of the local potential energy landscape.Our findings uncover a universal origin of glassy relaxation and offer an alternative approach to studying disordered systems.

关 键 词：glass transition metallic glass relaxation dynamics mechanical spectroscopy internal friction 

分 类 号：TG139.8[一般工业技术—材料科学与工程]