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A microscopic study of the quantum critical behavior of the spin-1/2 anisotropic Heisenberg models
- Publication Year :
- 1996
-
Abstract
- We extend our own previous applications of the microscopic coupled-cluster method (CCM) to quantum antiferromagnets. In particular, we carry out a systematic calculation involving high-order multispin correlations for the spin-1/2 anisotropic Heisenberg models on the one-dimensional chain and the two-dimensional square lattice. Their ground-state properties are obtained as functions of the anisotropy parameter. Our CCM analysis not only produces accurate results for such physical quantities as the ground-state energy which are comparable to the best results from other techniques, but it also enables us to study the quantum phase transitions of the spin models in a systematic and unbiased manner.
- Subjects :
- Condensed Matter::Strongly Correlated Electrons
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.od......2295..7933f7d8044087abebbf77857dd85fa4