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Abstract: Transitions between metabasins in supercooled liquids seem to occur throughrapid -democratic- collective particle rearrangements. Here we show that thisapparent homogeneous particle motion is a direct consequence of dynamicfacilitation. We do so by studying metabasin transitions in facilitated spinmodels and constrained lattice gases. We find that metabasin transitions occurthrough a sequence of locally facilitated events taking place over a relativelyshort time frame. When observed on small enough spatial windows these eventsappear sudden and homogeneous. Our results indicate that metabasin transitionsare essentially -non-democratic- in origin and yet another manifestation ofdynamical heterogeneity in glass formers.



Author: Lester O. Hedges, Juan P. Garrahan

Source: https://arxiv.org/







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