Solid-like mean-square displacement in glass-forming liquids

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

It was recently shown [S. P. Bierwirth et al., Phys. Rev. Lett. 119, 248001 (2017)] that the
real part of the frequency-dependent
uidity for nine glass-forming liquids of dierent chemistry
conforms to the zero-shape-parameter prediction of the Random Barrier Model for ac electrical
conduction in disordered solids. This surprising nding can be explained by the frequency-dependent

uidity being proportional to the frequency-dependent diusion coecient and the mean-square
displacement being well described by the Random Barrier Model. We present data from extensive
GPU based molecular dynamics simulations of a crystallization-resistant modication of the Kob-
Andersen binary Lennard-Jones mixture conrming this picture. This emphasizes the challenge of
explaining why a simple model based on hopping of non-interacting particles in a xed random
energy landscape can reproduce the complex and highly cooperative dynamics of glass-forming
liquids. Our data indicate, tentatively, that an understanding of this should refer to the highdimensional
conguration space, not 3d space.
OriginalsprogEngelsk
Artikelnummer1905.11514
TidsskriftCondenced Matter Soft
Vol/bind2019
Udgave nummer1905
Antal sider6
StatusUdgivet - 27 maj 2019

Citer dette

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title = "Solid-like mean-square displacement in glass-forming liquids",
abstract = "It was recently shown [S. P. Bierwirth et al., Phys. Rev. Lett. v119, 248001 (2017)] that the real part of the frequency -dependent fluidity for nine glass-forming liquids of different chemistry conforms to the zero-shape-parameter prediction of the Random Barrier Model for ac electrical conduction in disordered solids. This surprising finding can be explained by the frequency-dependent flu idity being proportional to the frequency-dependent diffusion coefficient and the mean-square displacement being well described by the Random Barrier Model. We present data from extensive GPU based molecular dynamics simulations of a crystallization-resistant modificati on of the Kob-Andersen binary Lennard-Jones mixture confirming this picture. This emphasizes the challenge of explaining why a simple model based on hopping of non-interacting particles in a fixed random energy landscape can reproduce the complex and highly cooperative dynamics of glass-forming liquids. Our data indicate, tentatively, that an understanding of this should refer to the high-dimensional configuration space, not 3d space.",
author = "Thomas Schr{\o}der and Jeppe Dyre",
year = "2019",
month = "5",
day = "27",
language = "English",
volume = "2019",
journal = "Condenced Matter Soft",
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}

Solid-like mean-square displacement in glass-forming liquids. / Schrøder, Thomas; Dyre, Jeppe.

I: Condenced Matter Soft, Bind 2019, Nr. 1905, 1905.11514, 27.05.2019.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Solid-like mean-square displacement in glass-forming liquids

AU - Schrøder, Thomas

AU - Dyre, Jeppe

PY - 2019/5/27

Y1 - 2019/5/27

N2 - It was recently shown [S. P. Bierwirth et al., Phys. Rev. Lett. v119, 248001 (2017)] that the real part of the frequency -dependent fluidity for nine glass-forming liquids of different chemistry conforms to the zero-shape-parameter prediction of the Random Barrier Model for ac electrical conduction in disordered solids. This surprising finding can be explained by the frequency-dependent flu idity being proportional to the frequency-dependent diffusion coefficient and the mean-square displacement being well described by the Random Barrier Model. We present data from extensive GPU based molecular dynamics simulations of a crystallization-resistant modificati on of the Kob-Andersen binary Lennard-Jones mixture confirming this picture. This emphasizes the challenge of explaining why a simple model based on hopping of non-interacting particles in a fixed random energy landscape can reproduce the complex and highly cooperative dynamics of glass-forming liquids. Our data indicate, tentatively, that an understanding of this should refer to the high-dimensional configuration space, not 3d space.

AB - It was recently shown [S. P. Bierwirth et al., Phys. Rev. Lett. v119, 248001 (2017)] that the real part of the frequency -dependent fluidity for nine glass-forming liquids of different chemistry conforms to the zero-shape-parameter prediction of the Random Barrier Model for ac electrical conduction in disordered solids. This surprising finding can be explained by the frequency-dependent flu idity being proportional to the frequency-dependent diffusion coefficient and the mean-square displacement being well described by the Random Barrier Model. We present data from extensive GPU based molecular dynamics simulations of a crystallization-resistant modificati on of the Kob-Andersen binary Lennard-Jones mixture confirming this picture. This emphasizes the challenge of explaining why a simple model based on hopping of non-interacting particles in a fixed random energy landscape can reproduce the complex and highly cooperative dynamics of glass-forming liquids. Our data indicate, tentatively, that an understanding of this should refer to the high-dimensional configuration space, not 3d space.

UR - http://glass.ruc.dk/pdf/articles/2019_cond-mat.soft_1905.11514.pdf

M3 - Journal article

VL - 2019

JO - Condenced Matter Soft

JF - Condenced Matter Soft

IS - 1905

M1 - 1905.11514

ER -