Boundary effects on symmetry resolved entanglement

• URL: http://arxiv.org/abs/2009.08508v1
• Date: Thu, 17 Sep 2020 19:34:34 GMT
• Title: Boundary effects on symmetry resolved entanglement
• Authors: Riccarda Bonsignori, Pasquale Calabrese
• Abstract summary: We study the symmetry resolved entanglement entropies in one-dimensional systems with boundaries. We derive exact formulas for the charged and symmetry resolved entropies based on theorems and conjectures.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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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