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Canonical sequence method applied to a two-dimensional spin system |
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| Authors: | Vassilios Fessatidis Jay D. Mancini |
| Affiliation: | a Physics Department, Fordham University, Bronx, NY 10458, USA b Department of Physical Sciences, Kingsborough College of the City University of New York, 2001 Oriental Boulevard, Brooklyn, NY 11235, USA c Department of Chemistry and Physics, Chicago State University, Chicago, IL 60628, USA |
| Abstract: | A number of years ago, Horn and Weinstein introduced a novel nonperturbative method, the t-expansion, for calculating ground-state expectation values for Hamiltonian systems. Recently Šamaj et al. have generalized the t-expansion technique and the related connected moments expansion to a more general canonical sequence. In the present work we have expounded upon this work and have applied this to the two-dimensional square anisotropic XXZ Heisenberg model. |
| Keywords: | 02.30.Mv 02.60.-x 75.50.Ee |
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