Elastoplasticity Mediates Dynamical Heterogeneity Below the Mode Coupling Temperature

As liquids approach the glass transition temperature, dynamical heterogeneity emerges as a crucial universal feature of their behavior. Dynamic facilitation, where local motion triggers further nearby, plays major role in this phenomenon. Here we show that long-range, elastically-mediated facilitation appears below mode-coupling adding to short-range component present at all temperatures. Our results suggest deep connections between supercooled liquid and states, pave way for deeper understanding glassy systems.