Coupled-cluster calculations for the ground- and excited-states of the spin-half XXZ model

Details Coupled-cluster calculations for the ground- and excited-states of the spin-half XXZ model Coupled-cluster calculations for the ground- and excited-states of the spin-half XXZ model

2011-07-04

arxiv.org/abs/1107.0599v3

Physics

Condensed Matter

Strongly Correlated Electrons

20 pages, 6 figures

Scientific paper

The coupled-cluster method is applied to the spin-1/2 antiferromagnetic XXZ model on a square lattice by employing an approximation which contains two-body long-range correlations and high-order four-body local correlations. Improvement is found for the ground-state energy, sublattice magnetization, and the critical anisotropy when comparing with the approximation including the two-body correlations alone. We also obtain the full excitation spectrum which is in good agreement with the quantum Monte Carlo results and the high-order spin-wave theory.

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