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arXiv · 1108.5523

Binary mixture of hard disks as a model glass former: Caging and uncaging

Sin-iti Sirono
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Abstract

I have proposed a measure for the cage effect in glass forming systems. A binary mixture of hard disks is numerically studied as a model glass former. A network is constructed on the basis of the colliding pairs of disks. A rigidity matrix is formed from the isostatic (rigid) sub--network, corresponding to a cage. The determinant of the matrix changes its sign when an uncaging event occurs. Time evolution of the number of the uncaging events is determined numerically. I have found that there is a gap in the uncaging timescales between the cages involving different numbers of disks. Caging of one disk by two neighboring disks sustains for a longer time as compared with other cages involving more than one disk. This gap causes two--step relaxation of this system.

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Sin-iti Sirono. 2011-08-29. Binary mixture of hard disks as a model glass former: Caging and uncaging. https://doi.org/10.1103/physrevb.84.104201

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