Symmetry resolved entanglement in gapped integrable systems: a corner transfer matrix approach

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We study the symmetry resolved entanglement entropies in gapped integrable lattice models.

• We use the corner transfer matrix to investigate two prototypical gapped systems with a U(1) symmetry: the complex harmonic chain and the XXZ spin-chain.
• While the former is a free bosonic system, the latter is genuinely interacting.
• We focus on a subsystem being half of an infinitely long chain.