TY  - JOUR
AU  - Peng, H. L.
AU  - Schober, H. R.
AU  - Voigtmann, Th.
TI  - Velocity autocorrelation function in supercooled liquids: Long-time tails and anomalous shear-wave propagation
JO  - Physical review / E
VL  - 94
IS  - 6
SN  - 1063-651X
CY  - Woodbury, NY
PB  - Inst.
M1  - FZJ-2017-05925
SP  - 060601 (R)
PY  - 2016
N1  - Web-Year 2016
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000400692500001
DO  - DOI:10.1103/PhysRevE.94.060601
UR  - https://juser.fz-juelich.de/record/836893
ER  -