J. Phys. Soc. Jpn. 57, pp. 4351-4358 (1988) [8 Pages]
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Received June 30, 1988
We systematically study the spin 1/2 quantum XXZ model on the square lattice using a quantum Monte Carlo method. The temperature dependence of the energy, specific heat and order parameter is calculated for the systems of sizes up to 16×16. Investigating the size dependence carefully, we exarnine the ground-state energy and the existence of the long-range order.
©1988 The Physical Society of Japan
KEYWORDS: quantum spin system, square lattice, Monte Carlo method, ground-state energy, long-range order
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