Cluster Glass Transition of Ultrasoft-Potential Fluids at High Density

Abstract

Using molecular dynamics simulation, we investigate the slow dynamics of a supercooled binary mixture of soft particles interacting with a generalized Hertzian potential. At low density, it displays typical slow dynamics near its glass transition temperature. At higher densities, particles bond together, forming clusters, and the clusters undergo the glass transition. The number of particles in a cluster increases one by one as the density increases. We demonstrate that there exist the multiple cluster-glass phases characterized by a different number of particles per cluster, each of which is separated by distinct minima. Surprisingly, a so-called higher order singularity of the mode-coupling theory signaled by a logarithmic relaxation is observed in the vicinity of the boundaries between monomer and cluster glass phases. The system also exhibits rich and anomalous dynamics in the cluster glass phases, such as the decoupling of the self- and collective dynamics.

5 pages, 4 figures + supplemental material

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Cited by in corpus (12)

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• Glass transitions in monodisperse cluster-forming ensembles: vortex matter in type-1.5 superconductors
• Coarse-grained Soft-Clusters Remain non-Diffusing in the Melt State
• Connecting glass-forming ability of binary mixtures of soft particles to equilibrium melting temperatures
• Slow dynamics coupled with cluster formation in ultrasoft-potential glasses
• Glassy phases of the Gaussian Core Model
• Dynamic Equivalence between Soft Star Polymers and Hard Spheres
• The thermal jamming transition of soft harmonic disks in two dimensions
• Temperature dependence of the transition packing fraction of thermal jamming in a harmonic soft sphere system
• Energy landscape description of the clustering transition for active soft spheres
• Pole Analysis of the Inter-Replica Correlation Function in a Two-Replica System as a Binary Mixture: Mean Overlap in the Cluster Glass Phase
• Decoupling of single-particle and collective dynamics in arrested phase-separating glassy mixtures