An approximate method for the investigation of the Potts antiferromagnet in zero external field at zero temperature |
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| Affiliation: | Institute of Mathematics and Physics, 81000 Titograd, Yugoslavia;Department of Physics and Meteorology, Faculty of Natural and Mathematical Sciences, P.O. Box 550, 11001 Belgrade, Yugoslavia |
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| Abstract: | We calculate the exact ground state degeneracy for the antiferromagnetic q-state Potts model in zero external field at zero temperature for two and three coupled chains. On the basis of these exact results the ground state degeneracy of the square lattice is expressed as an explicit function of q which is found to be a good approximation. |
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