Abstract
Starting from the Trotter formula, we derive several classical representations of the partition function of a spin-1/2 chain. We investigate the rate of convergence of the different approximants by means of exact calculations for small systems. We demonstrate that it is important to use approximants that have the same symmetry properties as the original quantum model.
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De Raedt, H., Lagendijk, A. & Fivez, J. Two-dimensional classical representations of the partition function of the spin-1/2 chain. Z. Physik B - Condensed Matter 46, 261–267 (1982). https://doi.org/10.1007/BF01360303
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DOI: https://doi.org/10.1007/BF01360303