Non-linear dynamic response of glass-forming liquids to random pinning

Abstract

We use large scale computer simulations of a glass-forming liquid in which a fraction c of the particles has been permanently pinned. We find that the relaxation dynamics shows an exponential dependence on c. This result can be rationalized by means of a simple theoretical Ansatz and we discuss its implication for thermodynamic theories for the glass-transition. For intermediate and low temperatures we find that the slowing down of the dynamics due to the pinning saturates and that the cooperativity decreases with increasing c, results which indicate that in glass-forming liquids there is a dynamic crossover at which the shape of the relaxing entities changes.

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• Effects of random pinning on the potential energy landscape of a supercooled liquid
• Low-Frequency Vibrational States in Ideal Glasses with Random Pinning
• Creating equilibrium glassy states via random particle bonding
• Screening and collective effects in randomly pinned fluids: A new theoretical framework