Entanglement spectrum of the Heisenberg XXZ chain near the ferromagnetic point

Vincenzo Alba, Masudul Haque, Andreas M. Laeuchli

We study the entanglement spectrum (ES) of a finite XXZ spin 1/2 chain in the limit Δ-> -1^+ for both open and periodic boundary conditions. At Δ=-1 (ferromagnetic point) the model…