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arXiv 0912.0193cond-mat.soft
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过冷液体中的雪崩和动力学关联

Avalanches and Dynamical Correlations in supercooled liquids

R. Candelier, A. Widmer-Cooper, J. K. Kummerfeld, O. Dauchot, G. Biroli, P. Harrowell, D. R. Reichman

摘要:

我们确定了二维玻璃形成液体的微观动力学弛豫模式。在短时间尺度上,不可逆粒子运动的爆发,称为笼跃,聚集成簇。在更大的时间尺度上,集群在空间和时间上都聚集成雪崩。这种传播的流动性,或动态促进,发生沿软区的系统,这已被确定通过计算isoconfigurational德拜-沃勒地图。我们的研究结果的特点,动力学的不均匀性在中度过冷液体的演变方式,并揭示它是一个致密的玻璃状颗粒介质中发现的非常相似。

英文摘要:

We identify the pattern of microscopic dynamical relaxation for a two dimensional glass forming liquid. On short timescales, bursts of irreversible particle motion, called cage jumps, aggregate into clusters. On larger time scales, clusters aggregate both spatially and temporally into avalanches. This propagation of mobility, or dynamic facilitation, takes place along the soft regions of the systems, which have been identified by computing isoconfigurational Debye-Waller maps. Our results characterize the way in which dynamical heterogeneity evolves in moderately supercooled liquids and reveal that it is astonishingly similar to the one found for dense glassy granular media.

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