Interfaces in driven Ising models: shear enhances confinement

Details Interfaces in driven Ising models: shear enhances confinement Interfaces in driven Ising models: shear enhances confinement

2008-02-26

arxiv.org/abs/0802.3811v2

Physics

Condensed Matter

Statistical Mechanics

4 pages, 3 figures Text modified, added Fig. 3b. To appear in Phys. Rev. Letters

Scientific paper

10.1103/PhysRevLett.101.067203

We use a phase-separated driven two-dimensional Ising lattice gas to study fluid interfaces exposed to shear flow parallel to the interface. The interface is stabilized by two parallel walls with opposing surface fields and a driving field parallel to the walls is applied which (i) either acts locally at the walls or (ii) varies linearly with distance across the strip. Using computer simulations with Kawasaki dynamics, we find that the system reaches a steady state in which the magnetisation profile is the same as that in equilibrium, but with a rescaled length implying a reduction of the interfacial width. An analogous effect was recently observed in sheared phase-separated colloidal dispersions. Pair correlation functions along the interface decay more rapidly with distance under drive than in equilibrium and for cases of weak drive can be rescaled to the equilibrium result.

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