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arXiv 2009.08508cond-mat.stat-mechhep-thquant-ph
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对称分辨纠缠的边界效应

Boundary effects on symmetry resolved entanglement

Riccarda Bonsignori, Pasquale Calabrese

摘要:

研究了一维边界系统的对称分辨纠缠熵。我们提供了一些共形不变理论的一般结果,然后移动到一个半无限链的自由费米子。我们考虑了从边界开始的区间和远离边界的区间,基于Toeplitz+Hankel矩阵谱的定理和定理,导出了荷熵和对称分辨熵的精确公式。为了使区间远离边界,我们证明了Toeplitz+Hankel矩阵的特征值与块Toeplitz矩阵的特征值之间的一般关系.一个重要的方面是,鞍点近似从带电对称分辨熵引入代数校正的缩放比在系统中更严重没有边界。

英文摘要:

We study the symmetry resolved entanglement entropies in one-dimensional systems with boundaries. We provide some general results for conformal invariant theories and then move to a semi-infinite chain of free fermions. We consider both an interval starting from the boundary and away from it. We derive exact formulas for the charged and symmetry resolved entropies based on theorems and conjectures about the spectra of Toeplitz+Hankel matrices. En route to characterise the interval away from the boundary, we prove a general relation between the eigenvalues of Toeplitz+Hankel matrices and block Toeplitz ones. An important aspect is that the saddle-point approximation from charged to symmetry resolved entropies introduces algebraic corrections to the scaling that are much more severe than in systems without boundaries.

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