首页|Low-frequency hybridized excess vibrations of two-dimensional glasses

Low-frequency hybridized excess vibrations of two-dimensional glasses

扫码查看
原文链接
  • NETL
  • NSTL
  • 万方数据
One hallmark of glasses is the existence of excess vibrational modes at low frequencies ω beyond Debye's prediction.Numerous studies suggest that understanding low-frequency excess vibrations could help gain insight into the anomalous mechanical and thermodynamic properties of glasses.However,there is still intensive debate as to the frequency depen-dence of the population of low-frequency excess vibrations.In particular,excess modes could hybridize with phonon-like modes and the density of hybridized excess modes has been reported to follow Dexc(ω)～ω2 in 2D glasses with an inverse power law potential.Yet,the universality of the quadratic scaling remains unknown,since recent work suggested that inter-action potentials could influence the scaling of the vibrational spectrum.Here,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 interac-tion to the hard-core one with both repulsion and attraction as well as to glasses with significant differences in density or interparticle repulsion.Moreover,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 attenuation.Our results indicate that the density bears some resemblance to the repulsive steepness of the interaction in influencing low-frequency properties.

density of statesvibrational modessound attenuationtwo-dimensional glasses

付立存、郑一鸣、王利近

展开 >

School of Physics and Optoelectronic Engineering,Anhui University,Hefei 230601,China

国家自然科学基金国家自然科学基金Anhui ProjectsAnhui ProjectsAnhui ProjectsHefei CityAnhui University(startup fund)Hefei Advanced Computing CenterBeijing Super Cloud Computing CenterHigh-Performance Computing Platform of Anhui University for providing computing resources

12374202120040012022AH020009S020218016Z010118169Z020132009

2024

10.1088/1674-1056/ad205e

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(5)
  • 64