%0 Journal Article
%A Peng, H. L.
%A Schober, H. R.
%A Voigtmann, Th.
%T Velocity autocorrelation function in supercooled liquids: Long-time tails and anomalous shear-wave propagation
%J Physical review / E
%V 94
%N 6
%@ 1063-651X
%C Woodbury, NY
%I Inst.
%M FZJ-2017-05925
%P 060601 (R)
%D 2016
%Z Web-Year 2016
%X 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−2 decay.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000400692500001
%R 10.1103/PhysRevE.94.060601
%U https://juser.fz-juelich.de/record/836893