Phys. Rev. B 40, 11437 (1989)

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Variational calculations for the square-lattice quantum antiferromagnet

Zhiping Liu and Efstratios Manousakis
Department of Physics and Center for Materials Research and Technology, Florida State University, Tallahassee, Florida 32306
(Received 5 September 1989)

We study the spin-1/2 Heisenberg antiferromagnet on a square lattice using variational Monte Carlo calculations. We construct a variational wave function which gives accurate ground-state energy and is consistent with sum rules for the dynamical structure function. The spin-wave velocity and the spin-stiffness constant can be calculated using sum rules. We obtain Zc==c/c0, where c0 is the classical spin-wave velocity. This and other ground-state quantities are in good agreement with spin-wave theory and Monte Carlo calculations.

©1989 The American Physical Society.

PACS: 75.10.Jm 74.20.-z




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