Yang-Lee Zeros Of The Antiferromagnetic Ising Model
PHYSICAL REVIEW LETTERS(2004)
摘要
There exists the famous circle theorem on the Yang-Lee zeros of the ferromagnetic Ising model. However, the Yang-Lee zeros of the antiferromagnetic Ising model are much less well understood than those of the ferromagnetic model. The precise distribution of the Yang-Lee zeros of the antiferromagnetic Ising model only with nearest-neighbor interaction J on LxL square lattices is determined as a function of temperature a=e(2betaJ) (J<0), and its relation to the phase transitions is investigated. In the thermodynamic limit (L-->infinity), the distribution of the Yang-Lee zeros of the antiferromagnetic Ising model cuts the positive real axis in the complex x=e(-2betaH) plane, resulting in the critical magnetic field +/-H-c(a), where H-c>0 below the critical temperature a(c)=root2-1. The results suggest that the value of the scaling exponent y(h) is 1 along the critical line for a更多
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关键词
thermodynamics,ising model,lattice theory,nearest neighbor,magnetic field
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