We consider the quantum easy-plane Heisenberg magnet on the square lattice. After the introduction of a suitable classical effective Hamiltonian, computer simulations, both for ferro- and antiferromagnets, were performed to obtain the spin correlation lengths. The effects of quantum fluctuations are quantitatively evaluated and discussed for different values of the spin, in a broad range of temperatures, above the Berezinskii-Kosterlitz-Thouless transitio
Quantum Berezinskii-Kosterlitz-Thouless transition in square-lattice magnets with easy-plane anisotropy / L. CAPRIOTTI; A. CUCCOLI; V. TOGNETTI; R. VAIA; P. VERRUCCHI. - In: PHYSICA D-NONLINEAR PHENOMENA. - ISSN 0167-2789. - STAMPA. - 119:(1998), pp. 68-72. [10.1016/S0167-2789(98)00065-7]
Quantum Berezinskii-Kosterlitz-Thouless transition in square-lattice magnets with easy-plane anisotropy
CUCCOLI, ALESSANDRO;TOGNETTI, VALERIO;
1998
Abstract
We consider the quantum easy-plane Heisenberg magnet on the square lattice. After the introduction of a suitable classical effective Hamiltonian, computer simulations, both for ferro- and antiferromagnets, were performed to obtain the spin correlation lengths. The effects of quantum fluctuations are quantitatively evaluated and discussed for different values of the spin, in a broad range of temperatures, above the Berezinskii-Kosterlitz-Thouless transitio
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