Entanglement spectrum of the Heisenberg XXZ chain near the ferromagnetic point

  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},
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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