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Kinetic Heterogeneities in a Highly Supercooled Liquid | | Ryoichi Yamamoto
; Akira Onuki
; | | Date: |
15 Jul 1998 | | Journal: | Journal of the Physical Society of Japan Vol 66, 2545 (1997) | | Subject: | Soft Condensed Matter; Disordered Systems and Neural Networks | cond-mat.soft cond-mat.dis-nn | | Abstract: | We study a highly supercooled two-dimensional fluid mixture via molecular dynamics simulation. We follow bond breakage events among particle pairs, which occur on the scale of the $alpha$ relaxation time $ au_{alpha}$. Large scale heterogeneities analogous to the critical fluctuations in Ising systems are found in the spatial distribution of bonds which are broken in a time interval with a width of order $0.05 au_{alpha}$. The structure factor of the broken bond density is well approximated by the Ornstein-Zernike form. The correlation length is of order $100 sigma_1$ at the lowest temperature studied, $sigma_1$ being the particle size. The weakly bonded regions thus identified evolve in time with strong spatial correlations. | | Source: | arXiv, cond-mat/9807218 | | Services: | Forum | Review | PDF | Favorites | |
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