An efficient implementation of high-order coupled-cluster techniques applied to quantum magnets

Details An efficient implementation of high-order coupled-cluster techniques applied to quantum magnets An efficient implementation of high-order coupled-cluster techniques applied to quantum magnets

1996-11-03

arxiv.org/abs/cond-mat/9611012v1

Physics

Condensed Matter

Statistical Mechanics

25 pages, including 8 figures

Scientific paper

We illustrate how the systematic inclusion of multi-spin correlations of the quantum spin-lattice systems can be efficiently implemented within the framework of the coupled-cluster method by examining the ground-state properties of both the square-lattice and the frustrated triangular-lattice quantum antiferromagnets. Various physical quantities including the ground-state energy, the anisotropy susceptibility, and the sublattice magnetisation are calculated and compared with those obtained from such other methods as series expansions and quantum Monte Carlo simulations.

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