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Driven lattice gas with nearest-neighbor exclusion: shear-like drive

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  • F. Q. Potiguar
  • R. Dickman

Abstract

We study the lattice gas with nearest-neighbor exclusion on the square lattice and Kawasaki (hopping) dynamics, under the influence of a nonuniform drive, via Monte Carlo simulation. The drive, which favors motion along the +x direction and inhibits motion in the opposite direction, varies linearly with y. (The boundaries along the drive direction are periodic, so that the system is not described by an equilibrium Gibbs distribution.) As in the uniformly driven case [R. Dickman, Phys. Rev. E 64, 16124 (2001)], the onset of sublattice ordering occurs at a lower density than in equilibrium, but here an unexpected feature appears: particles migrate out of the high-drive region. For intermediate system sizes (L ≃100), the accumulation of particles is sufficient for the low-drive region to become ordered at a global density of about 0.3. Above this density we observe a surprising reversal in the density profile, with particles accumulating to the high-drive region, due to jamming. For larger systems (L≥200) particles quickly jam in the high-drive region, as occurs under uniform drive, and the accumulation of particles in the low-field region is severely reduced. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

Suggested Citation

  • F. Q. Potiguar & R. Dickman, 2006. "Driven lattice gas with nearest-neighbor exclusion: shear-like drive," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 52(1), pages 83-90, July.
    • Handle: RePEc:spr:eurphb:v:52:y:2006:i:1:p:83-90
    DOI: 10.1140/epjb/e2006-00266-x
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