Glassiness, Rigidity and Jamming of Frictionless Soft Core Disks
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by
Daniel Vågberg, Peter Olsson, S. Teitel
2011
Abstract
The jamming of bi-disperse soft core disks is considered, using a variety of
different protocols to produce the jammed state. In agreement with other works,
we find that cooling and compression can lead to a broad range of jamming
packing fractions ϕ_J, depending on cooling rate and initial
configuration; the larger the degree of big particle clustering in the initial
configuration, the larger will be the value of ϕ_J. In contrast, we find
that shearing disrupts particle clustering, leading to a much narrower range of
ϕ_J as the shear strain rate varies. In the limit of vanishingly small
shear strain rate, we find a unique non-trivial value for the jamming density
that is independent of the initial system configuration. We conclude that shear
driven jamming is a unique and well defined critical point in the space of
shear driven steady states. We clarify the relation between glassy behavior,
rigidity and jamming in such systems and relate our results to recent
experiments.
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1007.2595v3
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