Phases of Two-Dimensional Heisenberg Spin Systems from Strong-Coupling Expansions
- 13 November 1978
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 41 (20) , 1337-1340
- https://doi.org/10.1103/physrevlett.41.1337
Abstract
A quantum-mechanical Hamiltonian formulation of lattice spin systems is used to search for phase transitions in the O(2), O(3), and O(4) Heisenberg models in two dimensions. Strong-coupling expansions which have been calculated through eighth order indicate a phase transition at nonzero coupling for the O(2) model, but the non-Abelian models are predicted to exist only in the strong-coupling phase.Keywords
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