Crossovers in the dynamics of supercooled liquids probed by an amorphous wall

Abstract

We study the relaxation dynamics of a binary Lennard-Jones liquid in the presence of an amorphous wall generated from equilibrium particle configurations. In qualitative agreement with the results presented in Nature Phys. {\bf 8}, 164 (2012) for a liquid of harmonic spheres, we find that our binary mixture shows a saturation of the dynamical length scale close to the mode-coupling temperature $T_c$. Furthermore we show that, due to the broken symmetry imposed by the wall, signatures of an additional change in dynamics become apparent at a temperature well above $T_c$. We provide evidence that this modification in the relaxation dynamics occurs at a recently proposed dynamical crossover temperature $T_s>T_c$, which is related to the breakdown of the Stokes-Einstein relation. We find that this dynamical crossover at $T_s$ is also observed for a system of harmonic spheres as well as a WCA liquid, showing that it may be a general feature of glass-forming systems.

10 pages, 8 figures

References in corpus (11)

• Theoretical perspective on the glass transition and amorphous materials
• Growing length and time scales in glass forming liquids
• Spontaneous and induced dynamic fluctuations in glass-formers I: General results and dependence on ensemble and dynamics
• Compressing nearly hard sphere fluids increases glass fragility
• Universal features of dynamic heterogeneity in supercooled liquids
• Locally preferred structures and many-body static correlations in viscous liquids
• Finite size effects in the dynamics of glass-forming liquids
• A critical test of the mode-coupling theory of the glass transition
• Decorrelation of the static and dynamic length scales in hard-sphere glass-formers
• Dynamical correlations in a glass-former with randomly pinned particles
• Dynamic Length Scales in Glass-Forming Liquids: A Inhomogeneous Molecular Dynamics Simulation Approach

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