2014/02/28 by Glen M. Hocky, Glen M Hocky, Ludovic Berthier +2 · 56 citations
Chemistry · Engineering · Materials Science · Mathematics · Physics and Astronomy · #Amorphous solid #Binary number #Chemistry #Condensed matter physics #Crossover #Crystallography #Dynamics (music) #Glass transition #Hard spheres #Material Dynamics and Properties #Materials science #Mathematics #Molecular dynamics #Nuclear magnetic resonance #Phase Equilibria and Thermodynamics #Physics #Quantum mechanics #Relaxation (psychology) #Statistical physics #Supercooling #Theoretical and Computational Physics #Thermodynamics #cond-mat.soft #cond-mat.stat-mech
paper · pdf · doi:10.1103/physreve.89.052311
published in Physical Review E 89(5), 052311 (American Physical Society) · 10 pages, 8 figures
openalex publication_date 2014/05/23 · arxiv created 2014/06/13 · arxiv updated 2014/06/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
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 by Kob et al. [Nat. Phys. 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 the harmonic spheres as well as a WCA liquid, showing that it may be a general feature of glass-forming systems.