Exact results for the zeros of the partition function of the Potts model on finite lattices

Details Exact results for the zeros of the partition function of the Potts model on finite lattices Exact results for the zeros of the partition function of the Potts model on finite lattices

1999-09-28

arxiv.org/abs/cond-mat/9909392v1

Physica A 281 (2000) 252

Physics

Condensed Matter

Statistical Mechanics

15 pages, 6 figures, RevTeX

Scientific paper

10.1016/S0378-4371(00)00022-4

The Yang-Lee zeros of the Q-state Potts model are investigated in 1, 2 and 3 dimensions. Analytical results derived from the transfer matrix for the one-dimensional model reveal a systematic behavior of the locus of zeros as a function of Q. For 12 they lie outside the unit circle for finite temperature. In the special case Q=2 the zeros lie exactly on the unit circle as proved by Lee and Yang. In two and three dimensions the zeros are calculated numerically and behave in the same way. Results are also presented for the critical line of the Potts model in an external field as determined from the zeros of the partition function in the complex temperature plane.

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