Entanglement at a two-dimensional quantum critical point: a numerical linked-cluster expansion study.

@article{Kallin2013EntanglementAA,
  title={Entanglement at a two-dimensional quantum critical point: a numerical linked-cluster expansion study.},
  author={Ann Berlinsky Kallin and Katharine Hyatt and Rajiv R. P. Singh and Roger G. Melko},
  journal={Physical review letters},
  year={2013},
  volume={110 13},
  pages={135702}
}
We develop a method to calculate the bipartite entanglement entropy of quantum models, in the thermodynamic limit, using a numerical linked-cluster expansion (NLCE) involving only rectangular clusters. It is based on exact diagonalization of all n×m rectangular clusters at the interface between entangled subsystems A and B. We use it to obtain the Renyi entanglement entropy of the two-dimensional transverse field Ising model, for arbitrary real Renyi index α. Extrapolating these results as a… CONTINUE READING
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