Low-frequency hybridized excess vibrations of two-dimensional glasses

作     者：付立存 郑一鸣 王利近 Licun Fu;Yiming Zheng;Lijin Wang

作者机构：School of Physics and Optoelectronic EngineeringAnhui UniversityHefei 230601China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2024年第33卷第5期

页      面：550-555页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 080101[工学-一般力学与力学基础] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.12374202 and 12004001) Anhui Projects(Grant Nos.2022AH020009,S020218016,and Z010118169) Hefei City(Grant No.Z020132009) Anhui University(start-up fund) 

主　　题：density of states vibrational modes sound attenuation two-dimensional glasses 

摘      要：One hallmark of glasses is the existence of excess vibrational modes at low frequenciesωbeyond Debye’s *** studies suggest that understanding low-frequency excess vibrations could help gain insight into the anomalous mechanical and thermodynamic properties of ***,there is still intensive debate as to the frequency dependence of the population of low-frequency excess *** particular,excess modes could hybridize with phonon-like modes and the density of hybridized excess modes has been reported to follow D_(exc)(ω)~ω^(2)in 2D glasses with an inverse power law ***,the universality of the quadratic scaling remains unknown,since recent work suggested that interaction potentials could influence the scaling of the vibrational ***,we extend the universality of the quadratic scaling for hybridized excess modes in 2D to glasses with potentials ranging from the purely repulsive soft-core interaction to the hard-core one with both repulsion and attraction as well as to glasses with significant differences in density or interparticle ***,we observe that the number of hybridized excess modes exhibits a decrease in glasses with higher density or steeper interparticle repulsion,which is accompanied by a suppression of the strength of the sound *** results indicate that the density bears some resemblance to the repulsive steepness of the interaction in influencing low-frequency properties.