2005/01/31 by Fabien Alet, Jesper Lykke Jacobsen, Gregoire Misguich +3
Physics and Astronomy · #cond-mat.stat-mech #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.94.235702
published as Phys. Rev. Lett. 94, 235702 (2005) · 4 pages, 4 figures; v2 : Added results on doped models; published version
arxiv created 2005/06/15 · arxiv updated 2009/12/01
We study a model of close-packed dimers on the square lattice with a nearest neighbor interaction between parallel dimers. This model corresponds to the classical limit of quantum dimer models [D.S. Rokhsar and S.A. Kivelson, Phys. Rev. Lett.\bf 61, 2376 (1988)]. By means of Monte Carlo and Transfer Matrix calculations, we show that this system undergoes a Kosterlitz-Thouless transition separating a low temperature ordered phase where dimers are aligned in columns from a high temperature critical phase with continuously varying exponents. This is understood by constructing the corresponding Coulomb gas, whose coupling constant is computed numerically. We also discuss doped models and implications on the finite-temperature phase diagram of quantum dimer models.