Abstract
We define two new models on the square lattice in which each allowed configuration is a superposition of a covering by “white” dimers and one by “black” dimers. Each model maps to a solid-on-solid (SOS) model in which the “height” field is two dimensional. Measuring the stiffness of the SOS fluctuations in the rough phase provides critical exponents of the dimer models. Using this “height” representation, we have performed Monte Carlo simulations. They confirm that each dimer model has critical correlations and belongs to a new universality class. In the “dimer-loop” model (which maps to a loop model) one height component is smooth, but has unusual correlated fluctuations; the other height component is rough. In the “noncrossing-dimer” model the heights are rough, having two different elastic constants; an unusual form of its elastic theory implies anisotropic critical correlations.
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Raghavan, R., Henley, C.L. & Arouh, S.L. New two-color dimer models with critical ground states. J Stat Phys 86, 517–550 (1997). https://doi.org/10.1007/BF02199112
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DOI: https://doi.org/10.1007/BF02199112