Renormalization group approach to the phase diagram of two-dimensional Heisenberg spin systems |
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| Authors: | Jose G. Esteve Amalio F. Pacheco |
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| Affiliation: | Nuclear Physics Department, Zaragoza University, Zaragoza, Spain;International Centre for Theoretical Physics, Trieste, Italy |
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| Abstract: | A renormalization group method is used to analyse the phase diagram of a quantum-mechanical Hamiltonian version of the O(2) and O(3) Heisenberg spin systems in two dimensions. It shows a phase transition at non-zero coupling for the O(2) model and no evidence of it for the O(3) model. |
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