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Diffusion and relaxation dynamics in cluster crystals.

Angel J Moreno1, Christos N Likos

  • 1Institut für Theoretische Physik II: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany.

Physical Review Letters
|October 13, 2007
PubMed
Summary
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Particles in ultrasoft fluids form crystals and move between lattice sites via activated hopping. This dynamic process maintains crystal structure, enabling diffusion and correlation relaxation.

Area of Science:

  • Condensed matter physics
  • Soft matter physics
  • Computational physics

Background:

  • Ultrasoft bounded pair potentials lead to unique fluid crystalline structures.
  • These crystals feature particle clusters at lattice sites with a constant lattice constant, independent of density.

Purpose of the Study:

  • Investigate the dynamic features of a representative ultrasoft fluid crystal.
  • Understand particle diffusion mechanisms and their impact on lattice structure and correlations.

Main Methods:

  • Computational simulations of a representative ultrasoft fluid system.
  • Analysis of particle diffusion, lattice dynamics, and correlation functions.

Main Results:

  • Particles exhibit activated hopping between lattice sites, preserving the crystal structure.

Related Experiment Videos

  • Hopping leads to finite diffusivity and complete relaxation of density correlations.
  • Simulations indicate an avoided localization transition and dynamic decoupling between self- and collective correlations.

    • Conclusions:

    • Activated hopping is a key dynamic mechanism in ultrasoft fluid crystals.
    • This mechanism governs transport properties and correlation dynamics.
    • The findings shed light on the interplay between structure and dynamics in soft matter systems.