Democratic particle motion for meta-basin transitions in simple glass-formers

Abstract

We use molecular dynamics computer simulations to investigate the local motion of the particles in a supercooled simple liquid. Using the concept of the distance matrix we find that the alpha-relaxation corresponds to a small number of crossings from one meta-basin to a neighboring one. Each crossing is very rapid and involves the collective motion of O(40) particles that form a relatively compact cluster, whereas string-like motions seem not to be relevant for these transitions. These compact clusters are thus candidates for the cooperatively rearranging regions proposed long times ago by Adam and Gibbs.

4 pages, 4 Postscript figures

References in corpus (3)

• Geometrical explanation and scaling of dynamical heterogeneities in glass forming systems
• Energy Barriers and Activated Dynamics in a Supercooled Lennard-Jones Liquid
• Particle rearrangements during transitions between local minima of the potential energy landscape of a supercooled Lennard-Jones liquid

Cited by in corpus (55)

• Theoretical perspective on the glass transition and amorphous materials
• The role of local structure in dynamical arrest
• Universal nature of particle displacements close to glass and jamming transitions
• Inhomogeneous Mode-Coupling Theory and Growing Dynamic Length in Supercooled Liquids
• Modeling the mechanics of amorphous solids at different length and time scales
• Spatial correlations in the dynamics of glassforming liquids: Experimental determination of their temperature dependence
• Avalanches and Dynamical Correlations in supercooled liquids
• Elastically Cooperative Activated Barrier Hopping Theory of Relaxation in Viscous Fluids. II. Thermal Liquids
• The building blocks of dynamical heterogeneities in dense granular media
• Geometric interpretation of pre-vitrification in hard sphere liquids
• Heterogeneous Dynamics, Marginal Stability and Soft Modes in Hard Sphere Glasses
• Coupling/decoupling between translational and rotational dynamics in a supercooled molecular liquid
• Localised soft modes and the supercooled liquid's irreversible passage through its configuration space
• A characteristic energy scale in glasses
• A Novel Route to Calculate the Length Scale for the Glass Transition in Polymers
• Structure and Dynamics of the Quasi-Liquid Layer at the Surface of Ice from Molecular Simulations
• The race to the bottom: approaching the ideal glass?
• Avalanches mediate crystallization in a hard-sphere glass
• Dynamics of particles and cages in an experimental 2D glass former
• Dynamics and energy landscape in a tetrahedral network glass-former: Direct comparison with models of fragile liquids
• From cage-jump motion to macroscopic diffusion in supercooled liquids
• Deconstructing the glass transition through critical experiments on colloids
• Dynamical Heterogeneities and Cooperative Motion in Smectic Liquid Crystals
• Soft modes and non-affine rearrangements in the inherent structures of supercooled liquids
• Dynamic phase coexistence in glass-forming liquids
• Influence of Confinement on Dynamical Heterogeneities in Dense Colloidal Samples
• Dynamical Heterogeneity in Lattice Glass Models
• Non-linear dynamic response of glass-forming liquids to random pinning
• Experimental verification of democratic particle motions by direct imaging of glassy colloidal systems
• Understanding fragility in supercooled Lennard-Jones mixtures. II. Potential energy surface
• Non-equilibrium Thermodynamics: Structural Relaxation, Fictive temperature and Tool-Narayanaswamy phenomenology in Glasses
• Cage-jump motion reveals universal dynamics and non-universal structural features in glass forming liquids
• Connecting short and long time dynamics in hard-sphere-like colloidal glasses
• Self-Organized Criticality Below The Glass Transition
• Exponential distributions of collective flow-event properties in viscous liquid dynamics
• A water structure indicator suitable for generic contexts: two-liquid behavior at hydration and nanoconfinement conditions and a molecular approach to hydrophobicity and wetting
• Equilibrium Fluctuations in Mean-field Disordered Models
• Dynamics in the Metabasin Space of a Lennard-Jones Glass Former: Connectivity and Transition Rates
• Dynamical Susceptibilities Near Ideal Glass Transitions
• Spatiotemporal intermittency and localized dynamic fluctuations upon approaching the glass transition
• Dynamic Length Scales in Glass-Forming Liquids: A Inhomogeneous Molecular Dynamics Simulation Approach
• A toy model mimicking cage effect, structural fluctuations and kinetic constraints in supercooled liquids
• Manipulating the Glass Transition in Nanoscale
• Correlation between rearrangements and soft modes in polymer glasses during deformation and recovery
• Discovery of a paired Gaussian and long-tailed distribution of potential energies in nanoglasses
• The Angell Plot from the Potential Energy Landscape Perspective
• Emergence of cooperatively reorganizing cluster and super-Arrhenius dynamics of fragile supercooled liquids
• Size dependence of dynamic fluctuations in liquid and supercooled water
• Changes of graph structure of transition probability matrices indicate the slowest kinetic relaxations
• Slowest kinetic modes revealed by metabasin renormalization
• Dynamic facilitation explains democratic particle motion of metabasin transitions
• Elastically Collective Nonlinear Langevin Equation Theory of Dynamics in Glass-Forming Liquids: Transient Localization, Thermodynamic Mapping and Cooperativity
• Breakdown of diffusivity-entropy scaling in colloidal glass forming liquids
• Mean first passage times reconstruct the slowest relaxations in potential energy landscapes of nanoclusters
• Evidence for compact cooperatively rearranging regions in a supercooled liquid