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We simulate binary soft disk systems in two dimensions, and investigate howthe dynamics slow as the area fraction is increased toward the glasstransition. The "fragility" quantifies how sensitively the relaxation timescale depends on the area fraction, and the fragility strongly depends on thecomposition of the mixture. We confirm prior results for mixtures of particleswith similar sizes, where the ability to form small crystalline regionscorrelates with fragility. However, for mixtures with particle size ratiosabove 1.4, we find that the fragility is not correlated with structuralordering, but rather with the spatial distribution of large particles. Thelarge particles have slower motion than the small particles, and act asconfining "walls" which slow the motion of nearby small particles. Therearrangement of these confining structures governs the lifetime of dynamicalheterogeneity, that is, how long local regions exhibit anomalously fast or slowbehavior. The strength of the confinement effect is correlated with thefragility and also influences the aging behavior of glassy systems.

The glass transition of two-dimensional binary soft disk mixtures with large size ratios