Journal
PHYSICAL REVIEW LETTERS
Volume 124, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.225501
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Funding
- Japan Society of the Promotion of Science (JSPS) [JP25000002, JP18H03675]
- Mitsubishi Foundation
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A key question in glass physics is what the origin of slow glassy dynamics is. The liquid structure is a natural candidate; however, an apparently severe counterexample has been known. Two model glass-forming liquids, with the standard Lennard-Jones interaction potential and its Weeks-Chandler-Andersen variation without the attractive tail, exhibit very similar structures at the two-body level but drastically different dynamical behaviors in the supercooled states. Here we look at the liquid structure through a (many-body) structural order parameter Theta characterizing the packing capability of local particle arrangements. We show that the structures of these two systems seen by Theta are actually very different at a many-body level, but, quite surprisingly, the macroscopic structure (Theta)-dynamics (tau(a)) relationships commonly follow a Vogel-Fulcher-Tanunann-like function. Furthermore, the mutual information analysis reveals strong local structure-dynamics correlations. Therefore, we conclude that attractive interactions affect the liquid structure in a nonperturbative manner, but a general structural origin of slow dynamics holds for these systems.
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