Unified percolation scenario for the and processes in simple glass formers
arXiv:2411.02922 · doi:10.1038/s41567-024-02762-z
Abstract
Given the vast differences in interaction details, describing the dynamics of structurally disordered materials in a unified theoretical framework presents a fundamental challenge to condensed-matter physics and materials science. Here, we numerically investigate a double-percolation scenario for the two most important relaxation processes of supercooled liquids and glasses, the so-called alpha and beta relaxations. For several simple glass formers, we find that when monitoring the dynamic shear modulus as temperature is lowered from the liquid state, percolation of immobile particles takes place at the temperature locating the alpha process. Mirroring this, upon continued cooling into the glass state, the mobile-particle percolation transition pinpoints a beta process whenever the latter is well separated from the main (alpha) process. For two-dimensional systems under the same conditions, percolation of mobile and immobile particles occurs nearly simultaneously and no beta relaxation can be identified. Our findings suggest that a general description of glassy dynamics should be based on a percolation perspective.
References in corpus (27)
- Theoretical perspective on the glass transition and amorphous materials
- Testing Mode-Coupling Theory for a Supercooled Binary Lennard-Jones Mixture I: The van Hove Correlation Function
- String-like Clusters and Cooperative Motion in a Model Glass-Forming Liquid
- Glassy dynamics of kinetically constrained models
- The Physics of the Colloidal Glass Transition
- Geometrical explanation and scaling of dynamical heterogeneities in glass forming systems
- The Excess Wing in the Dielectric Loss of Glass-Formers: A Johari-Goldstein beta-Relaxation?
- Strain localization and percolation of stable structure in amorphous solids
- Atomic-scale relaxation dynamics and aging in a metallic glass probed by X-ray photon correlation spectroscopy
- The Relationship of Dynamical Heterogeneity to the Adam-Gibbs and Random First-Order Transition Theories of Glass Formation
- Relaxation decoupling in metallic glassy state
- A universal origin for secondary relaxations in supercooled liquids and structural glasses
- Ac hopping conduction at extreme disorder takes place on the percolating cluster
- Minimal model for beta relaxation in viscous liquids
- Microscopic origin of excess wings in relaxation spectra of supercooled liquids
- Direct observation of percolation in the yielding transition of colloidal glasses
- Structure-dynamics relationships in cryogenically deformed bulk metallic glass
- Picosecond Dynamic Heterogeneity, Hopping and Johari-Goldstein Relaxation in Glassforming Liquids
- Elasticity, Facilitation and Dynamic Heterogeneity in Glass-Forming liquids
- Solid-that-flows picture of glass-forming liquids
- Elastoplasticity Mediates Dynamical Heterogeneity Below the Mode-Coupling Temperature
- Molecular dynamics simulations of the Johari-Goldstein relaxation in a molecular liquid
- The nature of non-phononic excitations in disordered systems
- Dynamical Correlation Length and Relaxation Processes in a Glass Former
- Johari-Goldstein relaxation in glassy dynamics originates from two-scale energy landscape
- Distance-as-time in physical aging
- Excess wings and asymmetric relaxation spectra in a facilitated trap model