Jammed particle configurations and dynamics in high-density Lennard-Jones binary mixtures in two dimensions

Hayato Shiba, Akira Onuki

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

We examine the changeover in the particle configurations and the dynamics in dense Lennard-Jones binary mixtures composed of small and large particles. By varying the composition at a low temperature, we realize crystal with defects, polycrystal with small grains, and glass with various degrees of disorder. In particular, we show configurations where small crystalline regions composed of the majority species are enclosed by percolated amorphous layers composed of the two species. We visualize the dynamics of configuration changes using the method of bond breakage and following the particle displacements. In quiescent jammed states, the dynamics is severely slowed down and is highly heterogeneous at any compositions. We apply shear flow by relative motions of boundary layers. Then plastic deformations multiply occur in relatively fragile regions, growing into large-scale shear bands where the strain is highly localized. Such bands appear on short time scales and evolve on long time scales with finite lifetimes.

Original languageEnglish
Pages (from-to)232-247
Number of pages16
JournalProgress of Theoretical Physics
Issue numberSUPPL. 184
Publication statusPublished - 2010 Nov 4
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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