Velocity autocorrelation function in supercooled liquids: Long-time tails and anomalous shear-wave propagation

被引：13

作者：

Peng, H. L. ^{[1
,2
]}

Schober, H. R. ^{[3
]}

Voigtmann, Th. ^{[1
,4
]}

机构：

[1] Deutsch Zentrum Luft & Raumfahrt DLR, Inst Mat Phys Weltraum, D-51170 Cologne, Germany

[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[3] Forschungszentrum Julich, Peter Grunberg Inst, D-52425 Julich, Germany

[4] Heinrich Heine Univ Dusseldorf, Dept Phys, Univ Str 1, D-40225 Dusseldorf, Germany

来源：

PHYSICAL REVIEW E | 2016年 / 94卷 / 06期

关键词：

STATIONARY RANDOM-MEDIA; LENNARD-JONES LIQUID; CLASSICAL FLUIDS; COMPUTER EXPERIMENTS; MOLECULAR-DYNAMICS; DECAY; DIFFUSION;

D O I：

10.1103/PhysRevE.94.060601

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Molecular dynamic simulations are performed to reveal the long-time behavior of the velocity autocorrelation function (VAF) by utilizing the finite-size effect in a Lennard-Jones binary mixture. Whereas in normal liquids the classical positive t(-3/2) long-time tail is observed, we find in supercooled liquids a negative tail. It is strongly influenced by the transfer of the transverse current wave across the period boundary. The t(-5/2) decay of the negative long-time tail is confirmed in the spectrum of VAF. Modeling the long-time transverse current within a generalized Maxwell model, we reproduce the negative long-time tail of the VAF, but with a slower algebraic t(-3/2) decay.

引用

页数：5

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