The Tower of States and the Entanglement Spectrum in a Coplanar Antiferromagnet

Understand

We extend the analytical arguments of Metlitski and Grover (arXiv:1112.5166) to compute the entanglement spectrum and entanglement entropy of coplanar antiferromagnets with $SO(3)$ order parameter symmetry.

• The low-energy states in the entanglement spectrum exhibit the tower of states structure, as is expected for systems that undergo spontaneous symmetry breaking.
• Our results are consistent with numerical results on the triangular and Kagom\'{e} lattice.