We study the finite-size corrections of the dimer model on infinity x N square lattice with two different boundary conditions: free and periodic. We find that the finite-size corrections depend in a crucial way on the parity of N, and show that, because of certain non-local features present in the model, a change of parity of N induces a change of boundary condition. Taking a careful account of this, these unusual finite-size behaviours can be fully explained in the framework of the c = -2 logarithmic conformal field theory.
Izmailian, N. Sh., Priezzhev, V. B., & Ruelle, P. (2007). Non-Local Finite-Size Effects in the Dimer Model. Symmetry Integrability And Geometry-methods And Applications, 3. https://hdl.handle.net/2078.5/59673 (Original work published 2007)