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We study the relaxation dynamics of a binary Lennard-Jones liquid in thepresence of an amorphous wall generated from equilibrium particleconfigurations. In qualitative agreement with the results presented in NaturePhys. {\bf 8}, 164 (2012) for a liquid of harmonic spheres, we find that ourbinary mixture shows a saturation of the dynamical length scale close to themode-coupling temperature $T_c$. Furthermore we show that, due to the brokensymmetry imposed by the wall, signatures of an additional change in dynamicsbecome apparent at a temperature well above $T_c$. We provide evidence thatthis modification in the relaxation dynamics occurs at a recently proposeddynamical crossover temperature $T_s > T_c$, which is related to the breakdownof 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.

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