Homogeneous nucleation under shear in a two-dimensional Ising model: cluster growth, coalescence and breakup

Details Homogeneous nucleation under shear in a two-dimensional Ising model: cluster growth, coalescence and breakup Homogeneous nucleation under shear in a two-dimensional Ising model: cluster growth, coalescence and breakup

2008-05-20

arxiv.org/abs/0805.3029v1

Physics

Condensed Matter

Soft Condensed Matter

11 pages, 13 figures

Scientific paper

10.1063/1.2981052

We compute rates and pathways for nucleation in a sheared two dimensional Ising model with Metropolis spin flip dynamics, using Forward Flux Sampling (FFS). We find a peak in the nucleation rate at intermediate shear rate. We analyse the origin of this peak using modified shear algorithms and committor analysis. We find that the peak arises from an interplay between three shear-mediated effects: shear-enhanced cluster growth, cluster coalescence and cluster breakup. Our results show that complex nucleation behaviour can be found even in a simple driven model system. This work also demonstrates the use of FFS for simulating rare events, including nucleation, in nonequilibrium systems.

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