Random trimer tilings

Details Random trimer tilings Random trimer tilings

2006-09-13

arxiv.org/abs/cond-mat/0609322v1

Physical Review E: Statistical, Nonlinear, and Soft Matter Physics 75 (2007) 011115

Physics

Condensed Matter

Statistical Mechanics

12 pages, 11 figures

Scientific paper

10.1103/PhysRevE.75.011115

We study tilings of the square lattice by linear trimers. For a cylinder of circumference m, we construct a conserved functional of the base of the tilings, and use this to block-diagonalize the transfer matrix. The number of blocks increases exponentially with m. The dimension of the ground-state block is shown to grow as (3 / 2^{1/3})^m. We numerically diagonalize this block for m <= 27, obtaining the estimate S = 0.158520 +- 0.000015 for the entropy per site in the thermodynamic limit. We present numerical evidence that the continuum limit of the model has conformal invariance. We measure several scaling dimensions, including those corresponding to defects of dimers and L-shaped trimers. The trimer tilings of a plane admits a two-dimensional height representation. Monte Carlo simulations of the height variables show that the height-height correlations grows logarithmically at large separation, and the orientation-orientation correlations decay as a power law.

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