8 Se p 19 99 Microcanonical Transfer Matrix and Yang - Lee Ze - ros of the Q - State Potts Model Richard
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چکیده
The Q-state Potts model in two dimensions is very fertile ground for the investigation of phase transitions and critical phenomena. For Q = 2 and 3 there is a second order phase transition between Q ferromagnetic ordered states and a disordered state. For Q = 4 the transition is also second order, but the usual critical behavior is modified by strong logarithmic corrections. For Q > 4 the transition is first order, with Q = 5 exhibiting weak first order behavior and a very large correlation length at the critical point. The Hamiltonian for the Potts model is
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