FM 08-16; arXiv:1612.01274

Authors: Alessandro Giuliani, Vieri Mastropietro, Fabio Toninelli

Title: Haldane realation for interacting dimers

Sommario: We consider a model of weakly interacting, close-packed, dimers on the two-dimensional square lattice. In a previous paper, we computed both the multipoint dimer correlations, which display non-trivial critical exponents, continuously varying with the interaction strength; and the height fluctuations, which, after proper coarse graining and rescaling, converge to the massless Gaussian field with a suitable interaction-dependent pre-factor (`amplitude'). In this paper, we prove the identity between the critical exponent of the two-point dimer correlation and the amplitude of this massless Gaussian field. This identity is the restatement, in the context of interacting dimers, of one of the Haldane universality relations, part of his Luttinger liquid conjecture, originally formulated in the context of one-dimensional interacting Fermi systems. Its validity is a strong confirmation of the effective massless Gaussian field description of the interacting dimer model, which was guessed on the basis of formal bosonization arguments. We also conjecture that a certain discrete curve defined at the lattice level via the Temperley bijection converges in the scaling limit to an SLEκ process, with κ depending non-trivially on the interaction and related in a simple way to the amplitude of the limiting Gaussian field.

Alessandro Giuliani
Dipartimento di Matematica e Fisica, Università degli Studi Roma Tre, 00146 Roma Italy

Vieri Mastropietro
Dipartimento di Matematica, Università degli Studi di Milano, 20133 Milano Italy

Fabio Toninelli
CNRS and Université de Lyon, Université Lyon 1, Institut Camille Jordan, 69622 Villeurbanne France