# Entanglement spectrum of the Heisenberg XXZ chain near the ferromagnetic point

@article{Alba2012EntanglementSO, title={Entanglement spectrum of the Heisenberg XXZ chain near the ferromagnetic point}, author={Vincenzo Alba and Masudul Haque and Andreas M. Laeuchli}, journal={arXiv: Strongly Correlated Electrons}, year={2012} }

We study the entanglement spectrum (ES) of a finite XXZ spin 1/2 chain in the limit \Delta -> -1^+ for both open and periodic boundary conditions. At \Delta=-1 (ferromagnetic point) the model is equivalent to the Heisenberg ferromagnet and its degenerate ground state manifold is the SU(2) multiplet with maximal total spin. Any state in this so-called "symmetric sector" is an equal weight superposition of all possible spin configurations. In the gapless phase at \Delta>-1 this property is…

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