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arXiv 0803.0444cond-mat.dis-nn
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正方格点上+- J伊辛模型的phase diagram中的多临界Nishimori点

Multicritical Nishimori point in the phase diagram of the +- J Ising model on a square lattice

Martin Hasenbusch, Francesco Parisen Toldin, Andrea Pelissetto, Ettore Vicari

摘要:

研究了正方晶格上无规键+- J伊辛模型在T-p相图中多临界Nishimori点的临界行为,其中T为温度,p为无序参数(p=1对应于纯伊辛模型).我们进行了有限尺寸标度分析的高统计蒙特卡罗模拟沿西森线定义的$2p-1={\rm Tanh}(1/T)$,沿多临界点所在。多临界Nishimori点位于p^*=0.89081(7),T^*=0.9528(4),控制多临界行为的算子的重整化群维数为y_1=0.655(15)和y_2 = 0.250(2);它们对应于热指数ν= 1/y_2=4.00(3)和交叉指数ν = y_1/y_2=2.62(6)。

英文摘要:

We investigate the critical behavior of the random-bond +- J Ising model on a square lattice at the multicritical Nishimori point in the T-p phase diagram, where T is the temperature and p is the disorder parameter (p=1 corresponds to the pure Ising model). We perform a finite-size scaling analysis of high-statistics Monte Carlo simulations along the Nishimori line defined by $2p-1={\rm Tanh}(1/T)$, along which the multicritical point lies. The multicritical Nishimori point is located at p^*=0.89081(7), T^*=0.9528(4), and the renormalization-group dimensions of the operators that control the multicritical behavior are y_1=0.655(15) and y_2 = 0.250(2); they correspond to the thermal exponent ν= 1/y_2=4.00(3) and to the crossover exponent ϕ= y_1/y_2=2.62(6).

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