Yang-Lee Zeros of the Triangular Ising Antifeffomagnets

Abstract

In our previous research, by combining both the exact enumeration method (microcanonical transfer matrix) for a small system () with the Wang–Landau Monte Carlo algorithm for large systems (to ) we obtained the exact and approximate densities of states , as a function of the magnetization and exchange energy , for a triangular-lattice Ising model. In this paper, based on the density of states , the precise distribution of the Yang–Lee zeros of triangular-lattice Ising antiferromagnets is obtained in a uniform magnetic field as a function of temperature for a 9×9 lattice system. Also, the feasibility of the Yang–Lee zero approach combined with the Wang–Landau algorithm is demonstrated; as a result, we obtained the magnetic exponents for triangular Ising antiferromagnets at various temperatures.