The existence of Neel order in the S=1/2 Heisenberg model on the square lattice at T=0 is shown using inequalities set up by Kennedy, Lieb and Shastry in combination with high precision Quantum Monte Carlo data.
Low-energy properties of anisotropic two-dimensional spin-1/2 Heisenberg models in staggered magnetic fields
Non-equilibrium properties of the S=1/2 Heisenberg model in a time-dependent magnetic field
Two-dimensional quantum spin-1/2 Heisenberg model with competing interactions
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