General Theory of Lee-Yang Zeros in Models with First-Order Phase Transitions

Abstract

We present a general, rigorous theory of Lee-Yang zeros for models with first-order phase transitions that admit convergent contour expansions. We derive formulas for the positions and the density of the zeros. In particular, we show that for models without symmetry, the curves on which the zeros lie are generically not circles, and can have topologically nontrivial features, such as bifurcation. Our results are illustrated in three models in a complex field: the low-temperature Ising and Blume-Capel models, and the $q$-state Potts model for $q$ large enough.

4 pgs, 2 figs, to appear in Phys. Rev. Lett

References in corpus (1)

• Yang-Lee zeros of the Q-state Potts model in the complex magnetic-field plane

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