Jordan-Wigner fermions and the spin-1/2 anisotropic XY model on a square lattice
arXiv:cond-mat/0111203
Abstract
Using the two-dimensional Jordan-Wigner fermionization we calculate the thermodynamic quantities of the (spatially anisotropic) square-lattice spin-1/2 anisotropic XY (XZ) model. We compare the results of different approaches for the ground-state and thermodynamic properties of the model.
5 pages, 2 figures