Critical Point Field Mixing in an Asymmetric Lattice Gas Model

Details Critical Point Field Mixing in an Asymmetric Lattice Gas Model Critical Point Field Mixing in an Asymmetric Lattice Gas Model

1993-06-19

arxiv.org/abs/cond-mat/9306042v1

Physics

Condensed Matter

10 Pages, LaTeX + 8 figures available from author on request, To appear in Z. Phys. B

Scientific paper

10.1007/BF01308815

The field mixing that manifests broken particle-hole symmetry is studied for a 2-D asymmetric lattice gas model having tunable field mixing properties. Monte Carlo simulations within the grand canonical ensemble are used to obtain the critical density distribution for different degrees of particle-hole asymmetry. Except in the special case when this asymmetry vanishes, the density distributions exhibit an antisymmetric correction to the limiting scale-invariant form. The presence of this correction reflects the mixing of the critical energy density into the ordering operator. Its functional form is found to be in excellent agreement with that predicted by the mixed-field finite-size-scaling theory of Bruce and Wilding. A computational procedure for measuring the significant field mixing parameter is also described, and its accuracy gauged by comparing the results with exact values obtained analytically.

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