Equilibrium Squeezing

Each square is a spin. Updates are asynchronous heat bath dynamics with respect to the Hamiltonian \[ H = -J \sum_i (s_i s_{i+\hat{x}} + s_i s_{i+\hat{y}}) - K \sum_i (s_{i - \hat{x}} s_i s_{i+\hat{x}} - s_{i - \hat{y}} s_i s_{i+\hat{y}}) - h \sum_i s_i. \] At \(h=K=0\) this is the standard Ising model. The \(K\) term breaks Ising symmetry while preserving Ising composed with inversion.