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Abstract: The transition of a fluid to a rigid glass upon cooling is a common route oftransformation from liquid to solid that embodies the most poorly understoodfeatures of both phases1,2,3. From the liquid perspective, the puzzle is tounderstand stress relaxation in the disordered state. From the perspective ofsolids, the challenge is to extend our description of structure and itsmechanical consequences to materials without long range order. Using computersimulations, we show that the localized low frequency normal modes of aconfiguration in a supercooled liquid are causally correlated to theirreversible structural reorganization of the particles within thatconfiguration. We also demonstrate that the spatial distribution of these softlocal modes can persist in spite of significant particle reorganization. Theconsequence of these two results is that it is now feasible to construct atheory of relaxation length scales in glass-forming liquids without recourse todynamics and to explicitly relate molecular properties to their collectiverelaxation.



Autor: Asaph Widmer-Cooper, Heidi Perry, Peter Harrowell, David R. Reichman

Fuente: https://arxiv.org/







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