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Hopping and microscopic dynamics of ultrasoft particles in cluster crystals | | Daniele Coslovich
; Lukas Strauss
; Gerhard Kahl
; | | Date: |
25 Jun 2010 | | Abstract: | We perform molecular dynamics and Monte Carlo simulations to investigate the
slow dynamics of ultrasoft particles in crystalline cluster phases. In our
model, point particles interact through the generalized exponential potential
u(r) = epsilon exp[-(r/ sigma)^n]. We focus on the dynamics of a generalized
exponential model with n=4 in its cluster fcc phase, and reveal how the
mechanisms of mass transport depend on the details of the microscopic dynamics.
In molecular dynamics simulations the diffusion of particles proceeds through
long-range jumps, guided by strong correlations in the momentum direction. In
Monte Carlo simulations, on the other hand, jump events are short-ranged,
reflecting the purely configurational nature of the dynamics. In contrast to
what was found in models of glass-forming liquids, the effect of different
microscopic dynamics cannot be accounted for by a temperature-independent
rescaling of the time units. From the obvious qualitative discrepancies in the
short time behavior between the two simulation methods and the non-trivial
difference in jump length distributions, long time relaxation, and dynamic
heterogeneity, we learn that a more complex modeling of the dynamics of
ultrasoft colloids is required. | | Source: | arXiv, 1006.4982 | | Services: | Forum | Review | PDF | Favorites | |
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