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

Peng, H. L. and Schober, H. R. and Voigtmann, Th. (2016) Velocity autocorrelation function in supercooled liquids: Long-time tails and anomalous shear-wave propagation. Physical Review E, 94, 060601(R). American Physical Society. DOI: 10.1103/PhysRevE.94.0606 ISSN 1539-3755

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Abstract

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.

Item URL in elib:https://elib.dlr.de/110080/
Document Type:Article
Title:Velocity autocorrelation function in supercooled liquids: Long-time tails and anomalous shear-wave propagation
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Peng, H. L.hailong.peng (at) dlr.deUNSPECIFIED
Schober, H. R.FZ JülichUNSPECIFIED
Voigtmann, Th.thomas.voigtmann (at) dlr.deUNSPECIFIED
Date:2016
Journal or Publication Title:Physical Review E
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:94
DOI :10.1103/PhysRevE.94.0606
Page Range:060601(R)
Publisher:American Physical Society
ISSN:1539-3755
Status:Published
Keywords:glass transition, velocity autocorrelation function, long time tails
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Materialwissenschaftliche Forschung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Voigtmann, Dr.rer.nat. Thomas
Deposited On:02 Jan 2017 07:14
Last Modified:10 Jan 2019 15:49

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