Quantum Monte Carlo study of S=1/2 weakly-anisotropic antiferromagnets on the square lattice

Alessandro Cuccoli, Tommaso Roscilde, Valerio Tognetti +2

We study the finite-temperature behaviour of two-dimensional S=1/2 Heisenberg antiferromagnets with very weak easy-axis and easy-plane exchange anisotropies. By means of quantum Mo…