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arXiv 2008.05764cond-mat.stat-mech
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计算二维Ising普适转变点的新方法:在Ashkin-Teller多临界点附近的应用

A new method to calculate a 2d ising universality transition point : application near the ashkin-teller multicritical point

S. Moriya, K. Nomura

摘要:

提出了一种新的方法来数值计算量子自旋模型中属于二维伊辛普适类的跃迁点。通常,在多临界点附近,在常规方法中,有限尺寸校正变得非常大。为了抑制多临界点的影响,我们使用了z轴扭曲边界条件和y轴扭曲边界条件。我们将我们的方法应用到一个S = 1/2键交替XXZ模型。这个模型的多临界点有一个BKT过渡,在那里的相关长度发散奇异。然而,我们的方法,计算的收敛性大大提高,因此,我们可以计算的过渡点,甚至附近的多临界点。

英文摘要:

We propose a new method to numerically calculate transition points that belongs to 2D Ising universality class for quantum spin models. Generally, near the multicritical point, in conventional methods, a finite size correction becomes very large. To suppress the effect of the multicritical point, we use a z-axis twisted boundary condition and a y-axis twisted boundary condition. We apply our method to an S = 1/2 bond-alternating XXZ model. The multicritical point of this model has a BKT transition, where the correlation length diverges singularly. However, with our method, the convergence of calculation is highly improved, thus we can calculate the transition point even near the multicritical point.

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