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Universal divergence of the Renyi entropy of a thinly sliced torus at the Ising fixed point

机译:在insing定点的薄切片薄荷的普遍分歧

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摘要

The entanglement entropy of a quantum critical system can provide universal numbers that depend on the geometry of the entangling bipartition. We calculate a universal number called kappa, which arises when a quantum critical system is embedded on a two-dimensional torus and bipartitioned into two cylinders. In the limit when one of the cylinders is a thin slice through the torus, kappa parameterizes a divergence that occurs in the entanglement entropy subleading to the area law. Using large-scale Monte Carlo simulations of an Ising model in 2 + 1 dimensions, we access the second Renyi entropy, and determine that, at the Wilson-Fisher (WF) fixed point, kappa(2,WF) = 0.0174(5). This result is significantly different from its value for the Gaussian fixed point, known to be kappa(2,Gaussian) approximate to 0.022 799 8.
机译:量子临界系统的纠缠熵可以提供依赖于缠绕性分层的几何形状的通用号码。我们计算称为Kappa的通用号码,当量子临界系统嵌入二维圆环上并分成两个汽缸。在限制时,其中一个气缸通过圆环薄片,Kappa参数化纠缠熵的纠缠熵发生的分歧。在2 + 1维度中使用大规模的蒙特卡罗模拟,我们访问第二个瑞尼熵,并确定,在威尔逊 - 费舍尔(WF)的定点,Kappa(2,WF)= 0.0174(5) 。该结果与高斯固定点的值显着不同,已知是Kappa(2,高斯)近似为0.022 799 8。

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  • 来源
    《Physical review》 |2019年第4期|045139.1-045139.9|共9页
  • 作者单位

    Perimeter Inst Theoret Phys Waterloo ON N2L 2Y5 Canada|Univ Waterloo Dept Phys & Astron Waterloo ON N2L 3G1 Canada;

    Perimeter Inst Theoret Phys Waterloo ON N2L 2Y5 Canada;

    Perimeter Inst Theoret Phys Waterloo ON N2L 2Y5 Canada|Univ Waterloo Dept Phys & Astron Waterloo ON N2L 3G1 Canada;

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