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arXiv · 1402.5974

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

Glen M Hocky·Ludovic Berthier·Walter Kob·David R. Reichman
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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.

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Glen M Hocky, Ludovic Berthier, Walter Kob, David R. Reichman. 2014-06-13. Crossovers in the dynamics of supercooled liquids probed by an amorphous wall. https://doi.org/10.1103/physreve.89.052311

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