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Magnetization processes of the spin-1/2 antiferromagnetic XXZ model in two and three spatial dimensions are studied using a quantum Monte Carlo method based on stochastic series expansions. A recently developed operator-loop algorithm enables us to show clear evidence of a first-order phase transition in the presence of an external magnetic field. Phase diagrams of closely related systems, hard core bosons with nearest-neighbor repulsions, are also discussed, focusing on the possibilities of phase-separated and supersolid phases

physical review. b, condensed matter

Numerical study of the spin-flop transition in anisotropic spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mfrac><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:mfrac></mml:math>antiferromagnets

Numerical study of the spin-flop transition in anisotropic spin-12antiferromagnets